[Gö...] Posted July 11, 2019 Share Posted July 11, 2019 scanning in threaded holes . How to ? example M8x1.25 Link to comment Share on other sites More sharing options...
[Am...] Posted July 11, 2019 Share Posted July 11, 2019 What dimension are you trying to measure? The minor diameter? Link to comment Share on other sites More sharing options...
[Me...] Posted July 11, 2019 Share Posted July 11, 2019 This what you want? delete the circle path. Link to comment Share on other sites More sharing options...
[Za...] Posted July 11, 2019 Share Posted July 11, 2019 English thread gradient/slope would be per example.... 1/4-20 1"/20=.050" 1/4-28 1"/28=.0357" 1/4-20 gradient/slope .050 1/4-28 gradient/slope .0357 Link to comment Share on other sites More sharing options...
[Gö...] Posted July 11, 2019 Author Share Posted July 11, 2019 I would like to query the depth of 17mm which is M10x1.5 female? Link to comment Share on other sites More sharing options...
[Za...] Posted July 11, 2019 Share Posted July 11, 2019 depth of what? minor diameter? full threads? Link to comment Share on other sites More sharing options...
[Gö...] Posted July 11, 2019 Author Share Posted July 11, 2019 actually trying to find out how deep it is Link to comment Share on other sites More sharing options...
[Za...] Posted July 11, 2019 Share Posted July 11, 2019 more information is needed to answer your question depth of what exactly? minor diameter? thread engagement? is it a blind hole? drill bottom? flat bottom? the cmm might not be the best way to measure...depending on the actual dimension Link to comment Share on other sites More sharing options...
[Gö...] Posted July 11, 2019 Author Share Posted July 11, 2019 [img][/img]20190711_193238.jpg Link to comment Share on other sites More sharing options...
[Za...] Posted July 11, 2019 Share Posted July 11, 2019 attempting to measure that on the cmm is not advised. I would use thread plug/calipers. It wants to know depth of full thread engagement Link to comment Share on other sites More sharing options...
[Am...] Posted July 11, 2019 Share Posted July 11, 2019 Yeah I would not use the CMM for that measurement. If you don't have thread plugs or anything to get to that, I would use something like an epoxy to make a cast of it and take a look on a comparator. Link to comment Share on other sites More sharing options...
[Mi...] Posted July 11, 2019 Share Posted July 11, 2019 I see few ways. 1. Get a thread gage and count how many turns it takes to reach the bottom. You can do that math to see how many it should take. On a 12mm deep 10x1.5 we take it to 8 turns. Your going 17. 2. Get a bolt that that is used for assy and measure the OAL. Bottom it out and re-measure what's left over out of the part. 3. Can you cut the part open and check it? Or use some rubber compound like the stuff flexbar puts out. Hell I have use modeling clay and a comparator. >>>Some of these are crude checks, but depending on tol might get you close. I always like to cut the part open but I work in a place I can do that with machine set up parts.<<<<< Link to comment Share on other sites More sharing options...
[Ni...] Posted July 25, 2019 Share Posted July 25, 2019 I've found scanning threaded holes for something as easy as position is a little unreliable. I recommend using hole location gauges that you screw into the hole and pickup the shank protruding upward for position. We've even made some at my shop quite easily. Just as long as you don't have many many holes as you'll need a lot and time wasted on setup/tear down. IMO If depth is not fussy you can even use a bolt for a depth calculation. Measure the length of the bolt, screw it into the hole until it stops, check length of bolt protruding with a vernier and subtract the two......easy https://www.threadcheck.com/m5-x-8-flex ... tion-gage/ Link to comment Share on other sites More sharing options...
[Me...] Posted July 25, 2019 Share Posted July 25, 2019 If you follow the cookbook's recommended settings, it seems to be more reliable than thread plugs. Just from my experience... I have heard that the thread plugs that have the nice little slot cut in them, which tighten as they go farther down, work very well. One thing that is annoying to do though, is having to find where the lead in thread is and then adjusting your height. Link to comment Share on other sites More sharing options...
[Ch...] Posted July 25, 2019 Share Posted July 25, 2019 Thread plugs are not always more reliable. In fact, the solid type thread plugs are less reliable than measuring on threads. Assuming you know how to effectively measure on threads. One thing I found was that in order to get realistic data, you must remove and reinsert the plugs in between every run. If you just leave the same plugs in the part then you will get artificially good data.25622 Plugs vs Threads for forum.pptxThreaded_Holes_metrology_conf_2011.pdf Link to comment Share on other sites More sharing options...
[Me...] Posted July 25, 2019 Share Posted July 25, 2019 Just to add: Thread plugs are checking a projected tolerance zone instead of the actual feature. If you have deep threads they can be misleading for orientation/location and won't find the deviations at the bottom of the thread and/or any deeper than the gage itself. Robert Link to comment Share on other sites More sharing options...
[Ni...] Posted July 25, 2019 Share Posted July 25, 2019 All very valid points and I do agree, especially with what you said Robert Davis. It all depends on your application, tolerance of feature position and accuracy. Link to comment Share on other sites More sharing options...
[Ja...] Posted July 25, 2019 Share Posted July 25, 2019 Chad, would you post a picture of the stylus you used in your study for picking up the thread pitch diameter, please? Thanks. Link to comment Share on other sites More sharing options...
[Ch...] Posted July 26, 2019 Share Posted July 26, 2019 It's just a 3mm down probe. I don't report any diameters on threads unless it is just for my own reference purposes. Link to comment Share on other sites More sharing options...
[Ri...] Posted July 26, 2019 Share Posted July 26, 2019 I wish more people used the self-center cylinder method. I too have real world experience and results with it. Can we also stop recommending the linear line scans as the default method? Link to comment Share on other sites More sharing options...
[De...] Posted July 26, 2019 Share Posted July 26, 2019 If you are scanning using self centering in the thread itself, aren't you in fact just hitting the tips on the minor diameter? If the ball is contacting on the flanks of the thread itself then that would be measuring the thread, but if its hitting the tips of the threads then it is fact just measuring the minor diameter - isn't it? For most small threads I have not found a stylus that is able to actually seat into the thread enough to contact the thread flanks without shanking. Link to comment Share on other sites More sharing options...
[Ja...] Posted July 29, 2019 Share Posted July 29, 2019 I'm not familiar with the self-center cylinder method. Would someone explain what that is please? Are you using self-centered single points and recalling them into a cylinder? Link to comment Share on other sites More sharing options...
[Ch...] Posted July 29, 2019 Share Posted July 29, 2019 Read the 'Threaded hole metrology conf 2011' from the prior page. It's explained on that. Link to comment Share on other sites More sharing options...
[Wi...] Posted July 29, 2019 Share Posted July 29, 2019 Use the thread gage and calculate number of turns... Link to comment Share on other sites More sharing options...
[Cl...] Posted July 30, 2019 Share Posted July 30, 2019 In the past I have measured the cylinder with linear lines, (min of 4 lines) I've seen good results with this method. Especially with a T/P tolerance of 0.5 You should get accurate location results, but not size. Link to comment Share on other sites More sharing options...
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