Mike, the tread is this one, in which you made the last post. As to using an M6x1 screw in a 1/4-28 hole, I won't comment...
I know there was a post on the tormach tool holder setscrews, I tried the search without any luck.
I have had problems with the setscrews in mine so I bought a couple new metric ones to replace them, they worked fine but were sloppy in the threads, kind of like a class 4 fit.
Today I was checking them out again and found that a 1/4- 28 fits the small toolholder and a 3/8- 24 fits the larger one. I guess they were supposed to be inch screws instead of metric ones? The metric sizes will fit but are sloppy in the threaded holes. I checked them with a thread pitch gage and they seem to be identical between the inch and metric ones.
I guess thats why the sloppy fit possibly so that both screws could be used?
My holders all use inch threads. With good quality inch set screws, the thread isn't sloppy at all.
If your tool holders are still sloppy after you switched to good inch hardware, it may be because the metric set screws damaged the thread.
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Evidently my assumption was wrong. I should have called the folks at Tormach about the correct replacement screw, although the screws mike out to be metric (.236 instead of .246) on the 1/4" size.
The M5 is similar to a 10-32, but in this case the m5 a few thou larger than the 10-32.
Well, a 1/4" setscrew uses a 1/8" hex wrench (.125" nominal) and an M6 setscrew uses a 3mm hex wrench (.118" nominal) so the 3mm wrench would not be all too loose in a 1/4" setscrew socket... BTW I forgot the last in my previous reply.
No comment there either...Originally Posted by mike sr1
BTW all my setscrew holders date from fall 2006 and have American threads on the setscrews.
Randy (who has never, ever, used a metric/inch hex wrench that "just about fit", no not ever... )
I have a variety of TTS holders from very old to very recent and the setscrew sizes vary rather widely between them...
The 1/2" holder is tapped 3/8 24, the screw thread is .010 undersize that was in it and the socket wrench doesnt fit well at all.
I was wrong in assuming they were metric, they just are not good quality setscrews as per TxFred.
I have been to the hardware and all is good! The screws that came out were ten thousanths undersize on the 3/8" ones......
Last edited by mike sr1; 04-04-2012 at 01:27 PM.
this post made me laugh. I have always meant to check the threads to figure out what size they were since neither 1/8 not 3mm have even a decent fit even for chinese hardware.