The teeth which engage with the bronze gear are retracted and the screw is tightened again. May be actuated manually, pneumatically, hydraulically or electrically. 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. I settled on a thread size of M23.6 Doing the maths (see below) it meant that I had plenty of meat left in the tube walls. You get a nice shiny thread (especially with cutting oil). We are the largest and most active discussion forum for manufacturing industry. It seemed to be reasonably successful and I didn't want to forget what I did, so having a long-term record should be useful for me. I'm not quite sure about all this, so I thought I would harden and temper the tip. When making your HSS threading tool you will also want to "hone" a slight radius on the cutting edge with a fine grinding stone. From the machinists point of view, cutting threads is a satisfying experience. Pleas, Internal and External threading on HF 7 x 10, Need help with internal threading Nexus 250MYII. The 2 wire method is brilliant. You will need left-hand threading tools, running the lathe in reverse. I often turned in reverse, machine cut better that way. 00mm threading The little arrow-shaped alignment tools you see are a pain and are only good for gaging hand-ground tool bits. For subscription issues please see THIS LINK. Cut the run out (in) groove as you would so that you can put the cut on and simply switch the lathe on with nuts engaged or engage the nut once upto speed if using the dial. I took the bottom of the toolpost down to about 3.5mm thick. Not particularly smoothly, but well enough.

Tom Lipton is a career metalworker from the San Francisco Bay area who has worked at various job shops. on Step 10, Have you shaved off some of the topslide casting? To make this happen, the following steps are done: TESTING Switching on the lathe will produce a different sound from normal. Thread files actually work. Standardized specifications are available to determine the desired results of the threading process. Features include gear- (speed) and feed-selector levers, toolpost, compound rest, lead screw and reversing lead screw, threading dial and rapid-traverse lever. by Harold_V Wed Dec 16, 2009 4:34 pm, Post If you do a lot of threading on a manual lathe, invest in a tool that accepts inserts. May also be fitted to the machine table to hold a workpiece. Should one choose to feed on the opposite side, it's possible for the cutting pressure to move the carriage away from the lead screw, with a net effect of an irregular lead (a drunken lead, or thread). hinged 16g captive septum hoop clicker When I bought the lathe, it came with a weirdly shaped boring bar. With all this geometry we know exactly how deep to cut our threads, which is useful for moving the tool in/out by the correct amount. If you buy a really cheap, plastic cooking spoon from a discount store, you end up with 30cm of polythene rod which is over 1cm in diameter. ear cuff ring triple When the half-nut lever on the apron is engaged, the apron/cross slide will travel slowly towards the chuck. google 'limit switch'. I did this for so many years. Lots of junk tooling but some things that were decent buys here and there. Setting up the lathe leadscrew and backgear, Preparing the tube for internal threading. Every day I ask myself, "What's the most fun thing to do today.". No, I put my 4-way toolpost in the 4-jaw chuck and took a carefully calculated amount off the bottom of it. The site is 100% free to join and use, so join today! (The additions/subtractions are done twice because the diameter is made up of threads on BOTH sides of the tube/bar) Finally. If however, I grind the tool to have a 10 degree offset (as described), then the toolpost has to be rotated by 10 degrees as well (so that the tool is now at 90 degrees to the axis).

That is already planned as the first second mod to the SC4! The more you do, the easier it gets. This enables the cut material to clear the tool more easily (and has less strain on the tool). I wasn't allowed to clean out chips that was someone else's job? Workholding device that affixes to a mill, lathe or drill-press spindle. By continuing to use this site, you agree to our use of cookies. If you follow me, the thread is then opened up, and the thread cutting tool is only cutting on one face. Best wishes and thanks for the advice on lubrication, etc. This vid as a demo of cutting an internal thread away from chuck.. same sort of process for external- reverse the lathe and cut from the back or with an inverted tool from the front. So the actual height of the metal thread in a properly formed nut is 5/8 of the full triangle height (1/8 'lost' due to the flat at the bottom of the thread and 1/4 'lost' due to the flat-top of the thread). Cut a short length, chuck it up and get threading. It is all a learning curve.

The Amazon tools worked just fine, as expected for aluminum. JMO from my experience. I think the offset of 29.5 degrees forces you to cut on one side of the thread only??? I didn't have an internal thread cutting tool, so I adapted a home-made tool-holding bar (which was made for undercutting). It covers the calculations, the preparation of the cutting tools and doing the whole job. This meant that the aluminium had some burring and a poorer finish than I would have liked. I make sure that there is a little slack in the meshing of all the gears (I guess this could be achieved by putting paper or foil between the gears when you tighten up the stud gears - I just make sure there is a little 'play'). I used the calculated dimension to know when to stop the top slide. They did fill a need, though. I was thinking the offset angle on the tool was to compensate for the 29.5 deg on the compound (didn't do the math to see that 10 != 29.5..) I guess my question is, why the angle offset on the tool? Maybe even a small grubscrew and brass pad to bear on the thread, if space allows? Edited By fishy-steve on 22/12/2018 17:31:31, Edited By fishy-steve on 22/12/2018 17:31:48. In many cases, people have a 'target' nut or bolt which they test when they are near the end. Sign up to our newsletter and get a free digital issue. I have yet to try it in the rear tool post. One ring holds coarse threads and the other holds fine ones. BobH. The inserts are precisely ground and easily changed. A thread file is ideal for straightening the annoying half thread fade at the beginning and end of an external thread. The finish I achieved was not brilliant. hi Steve, yes, but you are "lifting"the saddle off the bed. You will get less chatter and see whats happening down the bore. by Dave_C Wed Dec 16, 2009 12:50 pm, Post On the ML 10, this is 38 divisions on the dial). If your setup was rigid enough Im sure using the cross-slide straight in would also work fine. Any faster I would have a nervous breakdown. Your only fear then will be running into the tailstock - if you bother to use it to support the workpiece. 8 years ago Use the info in Step 3 to work out the dimensions you need. Watch the tool as it cuts (should only cut on the left-hand edge due to the angled top slide). For internal you either need a cack handed bar to cut at the back or mount it upside down cutting at the front. 8 years ago You can also get in touch about this website, advertising or other general issues. https://www.mesatool.com/product-page/1-2-thread-grooving-tool-id-od, https://www.amazon.com/dp/B098FMJ9VY/?tag=atomicindus08-20. If its good enough for the gage makers, its good enough for me. Yea, normal infeed with the compound. I do however have a fairly tight lathe and use 29.5 degrees on the compound to infeed. For other numerators, see the page extract - and the best of luck! I do usually use the green wheel to rough out a shape but then I go back and finish with the diamond wheel. It is 10.0mm across the flats which are (or should be) at the bottom of the threads. It should be noted that external and internal full form threading inserts do not necessarily produce the same form. Align your threading tool against a freshly faced end or against the side of the chuck. However, my hardened cutting tool was pretty black and I was not sure how to make it shiny! This will help "cut" the threads instead of smashing/ forming them (like in a zero rake tool), especially in aluminum. My Lathe is metric. All rights reserved. This did the job. Think I'll stick to the conventional method of screwcutting. Flip the tool over and run the lathe in reverse. https://www.youtube.com/watch?v=k1DHKjMtdQw. Do internal threading from the inside out with left-hand tools. Measuring across the external threads gave me a reading which was too large by 0.1mm or so. Strip or block of precision-ground stock used to elevate a workpiece, while keeping it parallel to the worktable, to prevent cutter/table contact. Doing work on Rifles I thread imperial. Chatter can be identified when lines or grooves appear at regular intervals in the workpiece. I did not bother in the end, I just used it in its hardened state - the aluminium would not tax the cutting tool too much. Oops - Made something too short, how to attach corrective shim ? Final note about using the 'numerator column' - see Step 1: Details of using the Numerator Column are given in the page extract image. The following maths seems unavoidable to me, once you stray away from the 'standard' threads. Try it. Lasers,Engraving,woodworking,MetalWorking,Industrial Equipment, Manufacturing technolgies, Machine Controllers Software and Solutions, I'm trying to do reverse threading in internal blind hole. To do subsequent passes, you can engage the half-nuts at any EVEN line on the thread indicator dial. To avoid stupid results, make sure you do the multiply bit first (eg 1.5155 x P) then do the addition/subtraction! - see next step). For a better experience, please enable JavaScript in your browser before proceeding. I don't know what a typical number of honing strokes people use (1, 5, 10, 20???). One of them had no internal hex in the head. So, I looked at the table and saw that a pitch of 1mm was one of the super-easy pitches. If you have a threaded spindle for your chuck, and you run the lathe backwards, you run the risk of unscrewing your chuck with disastrous results. In general, I was not overjoyed with the quality of the finish. It's amazing how much more you can see when things are magnified. In external threading, a calculated depth is required as well as a particular angle to the cut. Lay a rag across the ways or a little dab of grease helps.



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