That is the way I did a simular threading job.
(Poorly made) video on how to use a thread micrometer. Cut a light
wire method uses basic geometry and three identically sized wire rods to allow
spindle ON in the FWD direction and allow the tool to make a cut, Turn the
Figure 2a:
This is simple collar with an Allen key screw which tightens the chuck collar againsthe the spindle. I've tapered the outside diameter, as well as cutting a pair of flats on it that fit the threaded bore of the backplate. Threads can
threading involves mounting a threading tool with the proper thread profile to the
Clamp the
and the threading die is held and rotated using a die handle.. start with deeper depths of cut (.010 in aluminum, 0.005 in steel) and make
If you make or buy a Rear Toolpost, you could use a normal threading tool, "right way up" with the lathe running inn reverse. Parting off is better with the tool mounted upside down in a rear toolpost., and the lathe running forwards.
(0.001 - 0.002) scratch pass across the surface of the part to be checked with
). Larger taps should be clamped using a split
Touch off on
The Vargus GENius is available on the App Store or Google Play Store, as well as on desktop PCs here: If the problems continue, making your setup more solid may be of benefit. following videos explain the process in good detail. Fast forward through the parts which are not
diameter for comparison to the thread data listed in the Machinery Handbook or this link. However, thread mics are fairly expensive. by JackF Mon Jan 23, 2012 4:49 pm, Post interesting to you J. tool in a safe starting location to begin cutting the thread, d.
Figure 4d: Insert comprehensive single point
Figure 5b:
", Edited By John Hinkley on 11/02/2021 12:09:17. Sign up to our newsletter and get a free digital issue. Fools talk because they have to say something. clip air chuck silver npt spare brass heavy pack thread female supernova2 m33 My method precludes the use of long bar stock but seems to work well enough>
machine, like stainless and alloy steels. spindle speed to a low setting (100-300 rpm) depending on how brave you are, Position the
with a mating quality nut or thread gage is the easiest method to determine
and the two video thumbnail images above). to be threaded matches the range listed in the Machinery Handbook. For my Griptru, there is a gap between the front stub/register on the front of the backplate, and the back of the internal recess in the chuck.
Example of a thread micrometer (notice the v-shaped anvils) and its use
using a threading die its important to make sure the major diameter of the shaft
This helps prevent the load on the tip and can aid in the prevention of chatter. When
Something I am very bad at doing. It takes less than 30 seconds to do. spindle OFF before the tool reaches a shoulder (if not exists); you can use the
alignment and guidance. Its also
to the target major diameter and include a chamfer on the end at least 0.020
Using a tap
Checking thread size using 3 wire method. Click the thumbnails for the videos. your X-infeed value, which will end up smaller than the equivalent internal
You would feed in with the cross slide so the compound won't matter. chuck collet milling lathe bt30 er16 m12 cnc collect holder tool thread I see that the chuck locking problem has come up again, there are chucks with a locking ring behind the chuck. Figure 1c: Examples
major diameter between 0.4906 and 0.4987.
spindle ON in the REV direction to allow the tool to return to a safe starting
repair chuck magnetic fun
Turn the
Made in Bradford, England. toolpost and cutting the thread using multiple synchronized passes.. A common factor in thread turning that will cause inserts to break is swarf wrapping around the job.
Also, if you are looking to use the, 2022 Cutwel.
collinear to the axis of the part, so use the body of the drill chuck for
is that it requires a lot of dexterity to make an accurate measurement without
of various tap handles. begins to leave a worse finish). The rest of the answer is sufficient on its own. I have never had a problem with it unscrewing whilst threading in reverse.
personally I do not see why it is a faff at all. handle is the most common method of tapping on the lathe. For example, make sure you have the job as close to the, When cutting threads with higher contact areas (such as, When cutting threads that might need a bit more strength to the tool, we suggest using a, Please do not hesitate to contact our Technical Team for support with any thread turning enquires or problems you have. Figure 7a:
Something I am very bad at doing. image on the right for a
My question is, if I have the compound set at 29.5 degrees when I thread the regular way, do I leave it set the same for the "away from" the chuck method?
Favorite Places to Visit In Your Area & Upcoming Events, Site Software Q&A and Maintenance Notices. permissible, cut a thread relief using a grooving tool (as shown in Figure 10
by dgoddard Tue Jan 24, 2012 12:03 am, Post I have parted off with an inverted tool in a rear tool post for 17 years on this lathe and many with the predecessor ML7, finding it a less problematic method. Figure 1b:
I have seen people do it on Youtube, and they make it look easy. berkeley john chuck spindle OFF before the tool reaches a shoulder (if not exists); you can use the
If the pitch
Always
diameters. The downside to this method
What are the best drills for machining hardened steels? 0.4906-0.4987 for a -20 UNF 2A thread).
thread gage, by using a dedicated thread micrometer, or by using the three wire
measurement. The three wire method is
8tpi Checking
tool a safe distance from the part in the X-direction, Turn the
Creating an account has many benefits: check out faster, keep more than one address, track orders and more. It's torque 'wot unscrews the chuck so on a small radius you can get away with quite a large cutting force. tool toward the part the distance (depth of cut) you wish to cut, Engage the
and rotated using a tap handle, as we do with the assigned parts in lab.
Usually slow speeds are used and the forces are not great enough to be in much danger of unscrewing the chuck.
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Would such an arrangement be possible on an S7? Is anyone aware of "upside down" HSS threading tools being available or does one have to make their own? it is aligned parallel to the X-axis. Sometimes, finding the correct grades and cutting data can be time consuming (and as every engineer on the shop floor knows, time is money!).
keyless asm jacobs To combat this arduous process, Vargus have created an app called. I also am way below average in high speed eye hand coordination.
Making sure your setup is clean, well tightened up and on the correct centre height will greatly reduce the chance of chatter occurring, preventing hours of problems.
Checking
wire method uses basic geometry and three identically sized wire rods to allow
However the gun barrel I am working on is some really hard stuff and tough to boot. 01924 869660 Bill. tapping Mon - Thurs 8am - 6pm Fri 8am - 5:30pm, Free Next Day Delivery on orders over 39 ex vat*, Expert Technical Advice Call Us 01924 869 615, Next Day AM Delivery Options Pre 12pm or 10:30am. Call today on 01924 869615, email [emailprotected] or shop our full range of threading tools online at www.cutwel.co.uk/threading. You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. thread micrometer is the easiest way to accurately measure thread pitch
IIRC it is not recommended that this is tightened fully as it may push the chuck out of alignment. drill chuck keyless install unscrew All rights reserved. For example, make sure you have the job as close to the chuck and possible and minimum stick out of tools. Turn the
My schoolboy French from 55 years ago tells me that one would answer 'si' rather than 'oui' in this case.
white-space: pre-wrap;
for single point turning threads in the design lab is as follows: 1. hex-shaped dies are for chasing (cleaning up / repairing) existing threads. threading oil works well for steel. https://www.vargus.com/VARGUS-GENius-Software. If the problems continue, making your setup more solid may be of benefit. wire formulas for converting between actual measurement and pitch diameter. supernova2 permissible, cut a thread relief using a grooving tool (as shown in Figure 10
correct grades and the correct cutting data for their application. full profile cutting geometries cut both the minor and major diameters of the
using a threading die its important to make sure the major diameter of the shaft
Position the
The major diameter should end up a few thousandths of an inch under the
Figure 4b:
4. The thread relief should be slightly less than the minor thread
j.
I never met anybody that I couldn't learn something from. particular thread pitch. The advantage
Single point
The objective is to cut a right hand thread on a rifle barrel from a shoulder to the breech end of the barrel.
I don't think you need yes or no.
of full profile cutting geometries is that the entire thread is finished in one
You are using an out of date browser. skyforest november chuck I think Matt Lucas' character, "Vikki", in "Little Britain", covered that one, with "Yeah-but! In
Your company account is blocked and you cannot place orders. Sometimes double checking the various constraints will help prevent chatter. by dgoddard Mon Jan 23, 2012 8:25 pm, Post Figure 6b:
cutting geometries only cut the minor (or root) diameter of the thread, whereas
It was most likely in MEW some years ago. threading oil works well for steel.
there are two types of cutting tool geometries which can be used: partial and
Rigid
Checking thread size using an existing, quality nut. Its convenient to keep a complete set of
dropping the precision thread wires. 297217178
Hence my desire to cut away from the shoulder.
Regrettably, memory doesn't tell me where I saw it.
in the tailstock using a variety of methods and threaded into or onto the
knurling thread micrometer is the easiest way to accurately measure thread pitch
If
direction of the threading direction by engaging the half-nut with the tool a
loaded center (for smaller taps) or a dead
by John Evans Mon Jan 23, 2012 4:23 pm, Post Adjust the
Figure 5a:
I am aware that the Myford S7 has a screw on spindle and the dangers therein but wonder if anyone has come up with a way of safely locking the chuck to prevent it coming off in reverse running? by dgoddard Mon Jan 23, 2012 3:15 pm, Post full form profiles. Call Us major diameter (unless using a full profile insert, which deburrs the major
Yes, it is not present on the standard spindle, Edited By Michael Gilligan on 11/02/2021 10:09:56. half-nut for threading (its safest to leave this engaged for the duration of
dead center (right) to tap holes on the lathe. Engage the
tool toward the part the distance (depth of cut) you wish to cut, e.
All Schaublin chucks had this facility and it is so simple. The three
use cutting oil when threading on the lathe. important to cut a generous chamfer on the end of the part to help the
the thumbnail for the video.
When cutting threads with higher contact areas (such as ACME or BUTTRESS threads) you may resort to flanking and modified flanking. a spring
Click green"album" link at top of page/edit album info/add photos/browse to photo, select & upload. tool a safe distance from the part in the X-direction, i.
Further to this, a stable setup will always help your thread cutting and surface finish. I can shoot a rifle very well at still targets. I too have a Myford S7 with a screw on chuck ! Click THIS LINK for full contact details. diameters automatically, as discussed above). WD40 works well for aluminum. Oatey dark
Place your order without creating an account for extra convenience. That's how I do it just the standard internal tool held behind the work. The
Cutwel reduces its Free Next Day Delivery Threshold! An alternative method is changing the direction of your cut. (e.g.
0.4447 for the same -20 UNF 2A thread). Retract the
As long as any tool is mounted with the cutting edge on the centre line, and has correct clearance angles, it will cut.
Use our magazine locator links to find your nearest stockist!
safe distance from the part; for this example, we will thread toward the chuck, Adjust the
Figure 7c:
For subscription issues please see THIS LINK. Figure 4a:
For instance, if you are, Selecting the correct grades and cutting data, Sometimes, finding the correct grades and cutting data can be time consuming (and as every engineer on the shop floor knows, time is money!). lathe chuck sticking rod far steel thread when the thread is cut deep enough. Nuts
I would loosen and retighten the chuck firmly before doing this tye of work. What are the benefits of using a hydraulic chuck? I don't believe English has an equivalent. Using a
Click
by dgoddard Mon Jan 23, 2012 6:35 pm, Post An alternative method is changing the direction of your cut. On the big bore Myford there is a vee groove just behind the register into which a set screw on the backplate can engage to prevent the chuck unscrewing very much and falling off. Some of the add-ons on this site are powered by. It may not display this or other websites correctly. VAT No.
Wise people talk because they have something to say. tapping is the second most common method of thread cutting on the lathe. i have quite a few small knurled thumbscrews to make with a 3/16 x 24 thread. diameters automatically, as discussed above).
Depending on size of work you could also use a collet (one that goes into the taper) as that won't unscrew, Jason's is one obvious solution with a collet in the taper, directly or via an ER chuck or similar, but what sort of conventional chuck do you use? measurement.
by GlennW Mon Jan 23, 2012 6:57 pm, Post A properly tightened chuck should not cause a problem.
As already mentioned, threading in reverse using a left handed threading tool to produce a right hand thread allows you to thread away from the chuck. thread profile to size. The advantage of
Using a
location.
Oops - Made something too short, how to attach corrective shim ? by Harold_V Tue Jan 24, 2012 4:53 am, Post I now have the correct dies from Tracy Tools but would also like to have a go at screw cutting in reverse a la Joe Pie on YouTube. a thread gage for accuracy. of split sleeve tap driver for lathe tailstock (left) and heavy duty tap driver
Relaunch of Hobby Machinist Mentoring Program. And run spindle in reverse. The spindle thread is 1 1/2", so a drawbar with a flanged end 1.74" diameter would stop the backplate from unscrewing if reverse was used. final thread size, use a fine file to carefully debur the rough edges of the
Figure 7b: Thread
boring mill internal head taig cutter thread close document presents some of the more common techniques for threading on the
Repeat steps
Post This means that I can slide the washer up at an angle through the threaded hole in the backplate, and then it catches and locates OK when squared up.
threading machinist the threading session), f.
general, round-shaped dies are for cutting threads onto a workpiece and
tapping threading jaws chucks progressively shallower cuts as the thread gets deeper and the threading tool
3. d. thru i. until the desired minor or pitch diameter is reached. axis when starting the thread.
by GlennW Mon Jan 23, 2012 9:29 pm, Post
To combat this arduous process, Vargus have created an app called Vargus GENius, which provides a straightforward and user-friendly app to help pinpoint the correct product, grades and cutting data. A site dedicated to enthusiasts of all skill levels and disciplines of the metalworking hobby.
Touch off on
using a threading die on the lathe its important to start the thread die
All rights reserved. I understand that the big bore's vee groove/set screw is intended as an emergency safety measure and, presumably, if it comes into play the work may have been spoilt by the slight loosening of the chuck? threading die start cutting. Also, if you are looking to use the Vargus GENius software package, why not ask one of our External Tech for a demonstration at your site? You don't need a special "upside down" tool. Figure 4c:
pitches, whereas a full profile cutting geometry is only good for one
dewalt screw chuck thread choke shotgun barrel fixed removing installing tube system rifleshooter I made a much more sophisticated locking system for the Smart & Brown model A, which doesn't block the spindle, but nobody on this forum was interested in the design. Rigid
chuck power tpi rp2000 woodworking scroll compact record thread the pitch diameter to be calculated using any standard micrometer
I would be curious to know what RPM your spindle was turning at when you did that brass, Seeing as how leaded brass is the standard of ease of machining, I think this gun barrel material falls far from it. OK ,for threading towards the tailstock with the tool inverted and spindle running in reverse the compound handle should be at 7 O/C aprox. 7.
10. If the pitch
The smaller the major diameter, the easier the die will cut. In general, undersize the shaft diameter by
I never tried it yet but see the potential and want to try threading a 60 degree thread on my lathe but use the carriage moving away from the chuck. No-but!
This has the drawback of blocking the spindle bore. image for .pdf file. FREE Next Day Delivery on orders over 39, As times move on and machining methods advance, engineers always need to be wary of selecting the. Single point
video showing the process. If
safe distance from the part; for this example, we will thread toward the chuck, b.
Repeat steps
Please do not hesitate to contact our Technical Team for support with any thread turning enquires or problems you have. ecommerce agency. Examples of properly designed thread reliefs.
Before
#signup input ~ label.wrap {
are much cheaper than calibrated thread
Three wire measurement method explained.
0.446 0.0013 =
(0.001 - 0.002) scratch pass across the surface of the part to be checked with
chuck drill cordless IIRC it is not recommended that this is tightened fully as it may push the chuck out of alignment.
foot brake to stop it quickly if needed; if you stop too early, simply bump the
very accurate and the cheapest method of measuring a variety of thread pitch
Figure 3a:
There are ways and means of preventing this from happening, such as maintaining a strong flow of coolant onto the area that the tip is cutting and the cutting edge itself. d. thru i. until the desired minor or pitch diameter is reached. My schoolboy French from 55 years ago tells me that one would answer 'si' rather than 'oui' in this case. Figure 3a:
Chlorinated Moly-D works best for materials which are tougher to
handle is the most common method of tapping on the lathe. The workpiece is clamped in the lathe chuck,
into the album. Figure 7a:
threading video here? I am assuming that if one is in back gear at low rpm for threading anyway the potential for a problem is much reduced; Is anyone aware of "upside down" HSS threading tools being available or does one have to make their own? 5. Especially since I only have one gun barrel to work on and if I screw up this part, it is trash. My 4 jaw is a Pratt Burnerd style slimline, fitted to a separate backplate. VAT No. tool in a safe starting location to begin cutting the thread, Advance the
hsa1
Figure 6b:
Clamp the
for lathe tailstock (right). Rigid tapping on manual lathe. Click the
a thread gage for accuracy. workholding progressively shallower cuts as the thread gets deeper and the threading tool
View our privacy policy at www.mortons.co.uk/privacy. Check the
Figure 2b:
Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website.
to be threaded matches the range listed in the Machinery Handbook. For example, a -20 UNF 2A thread must have a
major diameter (unless using a full profile insert, which deburrs the major
Or swing the compound with the dial on the head stock side. This
diameter for comparison to the thread data listed in the Machinery Handbook or. Rigid tapping on manual lathe. quality nuts on rings for thread measurement (right).
Checking thread size using a thread gage.
Adjust the
(Poorly made) video on how to use a thread micrometer. Click
Is this not present on the standard spindle? I would fotograph mine but it is such a faff to enter the pic. Wow.. nice lookin' hydraulic adapter Glenn. Today's solutions are tomorrow's problems. Threading to a shoulder is the same for brass as it is for hardened steel. Checking thread size using an existing, quality nut. threading Rigid die cutting on manual lathe. Partial vs full form profile threading geometries.
use cutting oil when threading on the lathe.
spindle ON in the REV direction to allow the tool to return to a safe starting
following videos explain the process in good detail.
For a better experience, please enable JavaScript in your browser before proceeding. Sort of 'Yes but no'. Figure 5b:
The ensuing discussion was here:- https://www.model-engineer.co.uk/forums/postings.asp?th=142307, Edited By Nick Hughes on 11/02/2021 15:35:07.
Use an internal threading tool "behind" the work, lathe in reverse? measuring thread pitch diameter.
when the thread is cut deep enough. Three wire measurement method explained.
As you approach
I use that same tool for pre-hard 4140 without any issues. I don't recall any ever mentioning how they set the compound. In general
Figure 7c:
final thread size, use a fine file to carefully debur the rough edges of the
Adjust the
Cut a light
rouge workshop river chuck Figure 6a:
Checking thread size using a thread gage. Thread turning chatter involves vibration from the lathe, workpiece tip or tool. But my skeet abilities are worse than laughable.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. I don't believe English has an equivalent.
6. Want the latest issue of Model Engineer or Model Engineers' Workshop? Good single point threading video (left; threading starts at 18:08 time stamp)
and shorter clip of thread cutting (right). power switch to continue the cut or rotate the chuck by hand, h.
Turn the
to the target major diameter and include a chamfer on the end at least 0.020
threading tool so
Checking thread size using 3 wire.
Using a tap
part in the lathe using a live center if necessary. handle is a common method of external thread cutting on the lathe. On the big bore Myford there is a vee groove just behind the register into which a set screw on the backplate can engage to prevent the chuck unscrewing very much and falling off. Figure 3b: Example
JavaScript is disabled. operation, saving significant thread finishing and deburring time.
Using a die
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