| The Breakroom > The Water Cooler |
| When is half of 60 not half of 60 ? |
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| DavidA:
Andy, It all seems rather complicated compared with the 'normal' method. Don't most people just keep on cutting until the nut (or what ever) is a good fit ? That doesn't apply if you have no nut to try it against. The problem (B) you referred to can be eliminated by using the dial gauge method illustrated in my picture above. Dave. |
| andyf:
It does sound a bit complicated, David, but it isn't in practice. Anyway, I occasionally make my own silver steel taps for odd sizes and LH threads, where I may not have a nut to try because I need the tap to make the nut... Anyway, I'm too trigonometrically ignorant to want to calculate depth of thread x cos/the top slide angle! Andy |
| DavidA:
Andy, I haven't tried making taps yet. And I also don't fancy calculating the depth of cut allowance for the angle of the topslide. I'm going to have a go at making a collet chuck to fit my lathe ( inspired by Doubleboost's video; thanks John) and will need to make up the necessary gauges. Lots of thread cutting in my future. Dave. :D |
| ksor:
:scratch: :scratch: :scratch: :scratch: :scratch: :scratch: I'm preparing my FIRST thread cutting on my old 1A616 STANKO - so I'm looking for some GOOD explanations to my frustations :bang: :bang: :bang: Let me start with this: 1) "Explanation" has to do with pure theory - so pure and clear that you can understand the underlaying problems 2) "Practice" has to do with what "works for me" and what is "good enough for me" I think most (if not all) of these postings belongs to category 2) - don't spank me for saying that, but they don't give me the AHAaaa ! :( :( :( :( ... what ... something wrong with me ... no, no, of cause not :palm: :palm: Maybe I missed it, but I don't see any place mentioning the cutting tools angle to the Z-axis (the acxial turning axis) - I beleave it should be 90° - right ? IF THIS IS ADDED some of the postings - for me I beleave - can be moved from the 2) to 1) category - and then I can UNDERSTAND WHY to use - in principle - any degree (28, 29 or 29.5°) UP TO HALF of the threads degree, but absolutly NOT MORE than half ! As a consequence the FINAL CUT MUST be made by advancing the CROSS SLIDE to clean up the "saw-pattern" on the RIGHT side of the /\ <-- this side ! Did I get it right ? ... if not then spank me :wack: :wack: :wack: :wack: :wack: |
| dsquire:
--- Quote from: ksor on September 18, 2013, 03:48:30 PM --- :scratch: :scratch: :scratch: :scratch: :scratch: :scratch: I'm preparing my FIRST thread cutting on my old 1A616 STANKO - so I'm looking for some GOOD explanations to my frustations :bang: :bang: :bang: . . . As a consequence the FINAL CUT MUST be made by advancing the CROSS SLIDE to clean up the "saw-pattern" on the RIGHT side of the /\ <-- this side ! Did I get it right ? ... if not then spank me :wack: :wack: :wack: :wack: :wack: --- End quote --- ksor No spanking today. I think that you have it figured out now. :thumbup: :clap: Cheers :beer: Don |
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