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John Entwistle
On Sep 5, 2023, at 7:54 PM, Andrei <calciu1@...> wrote:
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Standardized tables only suggest the optimal dimensions. If you can live with a lesser fit and contact area for your application, there is nothing wrong with going that?route.
No offense taken, guys. I am just sharing information from standardized reference tables.?
The reality is that you could have a looser tap drill hole. You may just need to engage an additional thread to compensate for the looser fit and diminished contact area.?
Standardized tables only suggest the optimal dimensions. If you can live with a lesser fit and contact area for your application, there is nothing wrong with going that?route.
As for the collet chucks, with Chinese products it is always a craps shoot. Sometimes you get hardened and ground goods that are as good as western products, and other times you get chucks made out of cheese that you could thread with a toothpick. I have had
both experiences and I can't tell how to get one or the other. Seems it is like Schroedinger's cat: the chuck is good until it is not????
From: [email protected] <[email protected]> on behalf of Peter Brooks <peter@...>
Sent: Tuesday, September 5, 2023 1:47 PM
To: Carl <carl.blum@...>; [email protected] <[email protected]>
Subject: Re: [Unimat] end mill holder
Sent: Tuesday, September 5, 2023 1:47 PM
To: Carl <carl.blum@...>; [email protected] <[email protected]>
Subject: Re: [Unimat] end mill holder
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Hi Carl, it was one of those collet chucks that Andrei showed¡ I just gave up and will make a brass collet holder (when I have finished the U3 threading attachment - one thing leads to another!) to use with a purchased (and accurate!) front chuck piece.
We must have been typing at the same time - Andrei, no offense intended in my message but (like Carl) I had heard that for a metric thread the minimum pilot hole was the thread size minus the pitch. I guess that is just a general rule of thumb.
We must have been typing at the same time - Andrei, no offense intended in my message but (like Carl) I had heard that for a metric thread the minimum pilot hole was the thread size minus the pitch. I guess that is just a general rule of thumb.