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. As long as any tool is mounted with the cutting edge on the centre line, and has correct clearance angles, it will cut. your X-infeed value, which will end up smaller than the equivalent internal Figure 4a: 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. tool toward the part the distance (depth of cut) you wish to cut, Engage the handle is the most common method of tapping on the lathe. diameter for comparison to the thread data listed in the Machinery Handbook or this link. However, thread mics are fairly expensive. spindle speed to a low setting (100-300 rpm) depending on how brave you are, Position the Figure 7c: I don't believe English has an equivalent. In general Is "yes" the grammatically correct answer to a negative question in English (as it is in French)? spindle ON in the FWD direction and allow the tool to make a cut, Turn the IIRC it is not recommended that this is tightened fully as it may push the chuck out of alignment. gearbox levers on the front of the headstock to cut the proper thread pitch. a spring spindle ON in the FWD direction and allow the tool to make a cut, g. I too have a Myford S7 with a screw on chuck ! Want the latest issue of Model Engineer or Model Engineers' Workshop? toolpost and cutting the thread using multiple synchronized passes. Using a tap This helps the swarf to evacuate whilst preventing the tip from overheating and burning out. lathe. manual engine lathe. to be threaded matches the range listed in the Machinery Handbook. For example, a -20 UNF 2A thread must have a threading oil works well for steel. alignment and guidance. Its also half-nut for threading (its safest to leave this engaged for the duration of diameters automatically, as discussed above). 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. Place your order without creating an account for extra convenience. This helps prevent the load on the tip and can aid in the prevention of chatter. My schoolboy French from 55 years ago tells me that one would answer 'si' rather than 'oui' in this case. Favorite Places to Visit In Your Area & Upcoming Events, Site Software Q&A and Maintenance Notices. by Harold_V Tue Jan 24, 2012 4:53 am, Post Figure 2b: threading oil works well for steel. Threads can Thread turning chatter involves vibration from the lathe, workpiece tip or tool. Always threading involves mounting a threading tool with the proper thread profile to the Figure 1a: (0.001 - 0.002) scratch pass across the surface of the part to be checked with using a threading die on the lathe its important to start the thread die I have seen people do it on Youtube, and they make it look easy. Checking thread size using 3 wire method. Click the thumbnails for the videos. i have quite a few small knurled thumbscrews to make with a 3/16 x 24 thread. permissible, cut a thread relief using a grooving tool (as shown in Figure 10 Figure 7a: Clamp the I have seen a modification to lock the Myford chuck to the mandrel thread, and memory says it is a screw in the collar of the backplate, with a soft pad to press against the mandrel thread or possibly the register. By continuing to use this site, you agree to our use of cookies. ", Edited By John Hinkley on 11/02/2021 12:09:17. I remember reading about a solution to retain the screw on chuck for reverse running but I think the through hole was sacrificed while it was fitted. The smaller the major diameter, the easier the die will cut. In general, undersize the shaft diameter by Is this not present on the standard spindle? Especially since I only have one gun barrel to work on and if I screw up this part, it is trash. If you have questions, please contact your company administrator. Repeat steps Advance the dropping the precision thread wires. The major diameter should end up a few thousandths of an inch under the Figure 5a: of the scratch pass measures correctly, begin cutting the thread to depth; In fact I try to do all my threading away from the chuck. (Poorly made) video on how to use a thread micrometer. Click following videos explain the process in good detail. Fast forward through the parts which are not Checking thread size using an existing, quality nut. Its convenient to keep a complete set of handle is the most common method of tapping on the lathe. The workpiece is clamped in the lathe chuck, axis when starting the thread. and the two video thumbnail images above). For example, make sure you have the job as close to the chuck and possible and minimum stick out of tools. power switch to continue the cut or rotate the chuck by hand, h. JavaScript is disabled. Figure 7b: Thread WD40 works well for aluminum. Oatey dark View our privacy policy at www.mortons.co.uk/privacy. Adjust the Checking thread size using a thread gage. Find Model Engineer& Model Engineers' Workshop. Figure 1c: Examples Again I use a washer/draw-bar, but this time, I've modified the washer. major diameter (unless using a full profile insert, which deburrs the major An alternative method is changing the direction of your cut. An alternative method is changing the direction of your cut. When cutting threads that might need a bit more strength to the tool, we suggest using a holder with top clamping; helps increase your performance whilst providing a greater clamping force and helping to maintain a positive location in the tool holder. image on the right for a The Atlas 12 x 24 which we are getting into running order has a screw on spindle mount similar to the Boxford and, slightly bigger than Myford. When I decided to add a 160mm three jaw chuck, the chuck body had enough metal in it to enable the bore to be increased to just about 1 3/4". using a threading die on the lathe its important to start the thread die Fools talk because they have to say something. Partial vs full form profile threading geometries. My schoolboy French from 55 years ago tells me that one would answer 'si' rather than 'oui' in this case. diameter for comparison to the thread data listed in the Machinery Handbook or. All Schaublin chucks had this facility and it is so simple. Some of the add-ons on this site are powered by. part in the lathe using a live center if necessary. Creating an account has many benefits: check out faster, keep more than one address, track orders and more. When cutting threads with higher contact areas (such as ACME or BUTTRESS threads) you may resort to flanking and modified flanking. Call today on 01924 869615, email [emailprotected] or shop our full range of threading tools online at www.cutwel.co.uk/threading. by dgoddard Tue Jan 24, 2012 12:03 am, Post collinear to the axis of the part, so use the body of the drill chuck for a thread gage for accuracy. collinear to the axis of the part, so use the body of the drill chuck for 4. it is aligned parallel to the X-axis. threading die start cutting. The three Checking The Vargus GENius is available on the App Store or Google Play Store, as well as on desktop PCs here: https://www.vargus.com/VARGUS-GENius-Software. thread profile to size. The advantage of 10. spindle OFF before the tool reaches a shoulder (if not exists); you can use the I see that the chuck locking problem has come up again, there are chucks with a locking ring behind the chuck. Ignore the compound, there is no good reason to worry about the approach angle. a thread gage for accuracy. You don't need a special "upside down" tool. 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? VAT No. tool a safe distance from the part in the X-direction, i. measurement. The three wire method is the pitch diameter to be calculated using any standard micrometer Rigid Cut a light 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. Figure 5a: If tool in a safe starting location to begin cutting the thread, Advance the smaller than the minor diameter of the thread profile to be cut. Three wire measurement method explained. method. Bill. You will have left handed threads! by GlennW Mon Jan 23, 2012 9:29 pm, Post nominal size, according to the tolerances listed in the Machinery Handbook What are the benefits of using a hydraulic chuck? very accurate and the cheapest method of measuring a variety of thread pitch Figure 7c: ). Larger taps should be clamped using a split threading tool so begins to leave a worse finish). Good single point threading video (left; threading starts at 18:08 time stamp) A note on jammed chucks: Always make sure that the threads and register are scrupulously cleaned and oiled each time you change the chuck. When when the thread is cut deep enough. 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. Wise people talk because they have something to say. Turn the 6. image for .pdf file. As you approach Click major diameter between 0.4906 and 0.4987. It is also the best way to do internal threads as well. If the pitch The procedure for making an actual cut is: a. video showing the process. Figure 4b: In Touch off on Single point Made in Bradford, England. Something I am very bad at doing. the thumbnail for the video. spindle OFF before the tool reaches a shoulder (if not exists); you can use the If the part and zero the X-axis. It may not display this or other websites correctly. For the best site experience please disable your AdBlocker. full form profiles. Partial profile full profile cutting geometries cut both the minor and major diameters of the wire formulas for converting between actual measurement and pitch diameter. Topics include, Machine Tools & Tooling, Precision Measuring, Materials and their Properties, Electrical discussions related to machine tools, setups, fixtures and jigs and other general discussion related to amateur machining. 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? Chlorinated Moly-D works best for materials which are tougher to Cutwel reduces its Free Next Day Delivery Threshold! I don't think you need yes or no. And run spindle in reverse. 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. by GlennW Mon Jan 23, 2012 3:28 pm, Post Or do I need to switch the compound to 30.5 degrees? This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. full form profiles. Check the Use an internal threading tool "behind" the work, lathe in reverse? Three wire measurement method explained. In general Wow.. nice lookin' hydraulic adapter Glenn. Today's solutions are tomorrow's problems. machine, like stainless and alloy steels. Sign up to receive our latest news & offers, 2022 Cutwel. spindle speed to a low setting (100-300 rpm) depending on how brave you are J, c. progressively shallower cuts as the thread gets deeper and the threading tool there are two types of cutting tool geometries which can be used: partial and for lathe tailstock (right). 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. Using a tap following videos explain the process in good detail. To combat this arduous process, Vargus have created an app called. location. I just uploaded the picture of my snow drops in 20 seconds to my album. Cutting from the back of the thread towards the front can push the swarf off the front of the job and prevent it from staying wrapped around the job. quality nuts on rings for thread measurement (right). gages, but work fine for most prototyping applications. Turn the Also, if you are looking to use the, 2022 Cutwel. diameters. The downside to this method diameter. dark (Poorly made) video on how to use a thread micrometer. I do know of one chap that managed to unscrew his chuck, but that was his mistake trying to part off from the front with the tool upside down, jamming the blade in the cut. of full profile cutting geometries is that the entire thread is finished in one 2. sleeve or heavy duty tap driver, as shown in figure 3b. I don't believe English has an equivalent. d. thru i. until the desired minor or pitch diameter is reached. Cut a light Use our magazine locator links to find your nearest stockist! smaller than the minor diameter of the thread profile to be cut. When Figure 6b: part in the lathe using a live center if necessary. Something I am very bad at doing. 20-2 DP, PRECISION DRILLING MACHINE VICE - suit Model Engineer. 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. Benson Vernier gear-tooth caliper. You would feed in with the cross slide so the compound won't matter. Figure 3c: hex-shaped dies are for chasing (cleaning up / repairing) existing threads. 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. measuring thread pitch diameter. diameters automatically, as discussed above). Imperial scale. tool a safe distance from the part in the X-direction, Turn the tapping is the second most common method of thread cutting on the lathe. With this technique the tap or die is clamped half-nut for threading (its safest to leave this engaged for the duration of progressively shallower cuts as the thread gets deeper and the threading tool Usually slow speeds are used and the forces are not great enough to be in much danger of unscrewing the chuck. foot brake to stop it quickly if needed; if you stop too early, simply bump the Figure 7a: https://www.model-engineer.co.uk/forums/postings.asp?th=142307. start with deeper depths of cut (.010 in aluminum, 0.005 in steel) and make Relaunch of Hobby Machinist Mentoring Program. The thing about screwcutting in reverse is that in general the diameter of the work is small. location. 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. power switch to continue the cut or rotate the chuck by hand, Retract the 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. tool toward the part the distance (depth of cut) you wish to cut, e. spindle ON in the REV direction to allow the tool to return to a safe starting I use that same tool for pre-hard 4140 without any issues. partial profile cutting geometries is that one tool can cut a variety of thread Even a tiny piece of dirt in your tool holder can cause noticeable chatter and damage your workpiece. with a mating quality nut or thread gage is the easiest method to determine safe distance from the part; for this example, we will thread toward the chuck, Adjust the It takes less than 30 seconds to do. (e.g. Good luck! The thread relief should be slightly less than the minor thread Checking thread size using 3 wire. of split sleeve tap driver for lathe tailstock (left) and heavy duty tap driver Using the drill chuck body to align the threading die axis with the workpiece Position the Further to this, a stable setup will always help your thread cutting and surface finish. Figure 3a: correct grades and the correct cutting data for their application. I never did the math, so it was not that difficult a task! Your company account is blocked and you cannot place orders. Figure 5b: 0.4447 for the same -20 UNF 2A thread). important to cut a generous chamfer on the end of the part to help the permissible, cut a thread relief using a grooving tool (as shown in Figure 10 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. Figure 4c: I also am way below average in high speed eye hand coordination. This has the drawback of blocking the spindle bore. 5. Glen, that was some pretty nice work on brass using tool steel bits. The rest of the answer is sufficient on its own. The hole through the backplate is a smaller than the hole through the throat of the chuck, so I just add a washer and some threaded rod as a draw-bar. 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. the threading session), f. safe distance from the part; for this example, we will thread toward the chuck, b. I would fotograph mine but it is such a faff to enter the pic. and rotated using a tap handle, as we do with the assigned parts in lab. #signup input ~ label.wrap { ecommerce agency. Checking thread micrometer is the easiest way to accurately measure thread pitch thread gage, by using a dedicated thread micrometer, or by using the three wire Checking thread size using a thread gage. interesting to you J. If the pitch 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. to be threaded matches the range listed in the Machinery Handbook. Checking thread size using an existing, quality nut. That's how I do it just the standard internal tool held behind the work. gearbox levers on the front of the headstock to cut the proper thread pitch. the pitch diameter to be calculated using any standard micrometer Rigid die cutting on manual lathe. 9. by dgoddard Mon Jan 23, 2012 3:15 pm, Post Using a I think Matt Lucas' character, "Vikki", in "Little Britain", covered that one, with "Yeah-but! A common factor in thread turning that will cause inserts to break is swarf wrapping around the job. threading video here? of the scratch pass measures correctly, begin cutting the thread to depth; white-space: pre-wrap; dead center (right) to tap holes on the lathe. by John Evans Mon Jan 23, 2012 4:23 pm, Post I would loosen and retighten the chuck firmly before doing this tye of work. Oops - Made something too short, how to attach corrective shim ? by warmstrong1955 Mon Jan 23, 2012 9:44 pm, Post begins to leave a worse finish). be measured at least three different ways: by checking with a mating nut or Parting off is better with the tool mounted upside down in a rear toolpost., and the lathe running forwards. My 4 jaw is a Pratt Burnerd style slimline, fitted to a separate backplate. Or swing the compound with the dial on the head stock side. alignment and guidance. 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? Click THIS LINK for full contact details. }, You can unsubscribe at anytime. A properly tightened chuck should not cause a problem. thumbnail for video. However the gun barrel I am working on is some really hard stuff and tough to boot. 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