[David Bord]

definite kudos Neil.
I didn't look at it close enough to notice it was homespun (til now).
The usual suppliers make these indexable single point tools as well for those that don't want to machine their own.

Back at the OP.
105 holes @ 1/2-20 in 4140HT, I strongly suggest you get a thread mill and just be done with it. You will be very pleased with the result and will likely save the cost of the thread mill in labour alone (not to mention the number of taps you will burn out).

Darebee, any chance you can link to an example that would work the way Neil is using his with the right geometry when mounted in a mill? I would much rather purchase if reasonably priced.

David

[DareBee]

http://www.vardexusa.com/vardex-pdf/...g_products.pdf

Harvey Tool - Find Single Form Thread Milling Cutters at Harvey Tool!

[bevinp]

It seems that MSC thinks there are only two other countries in the world Canada and Mexico? I tried to register and that is what wouldn't let me, who blew the rest of the world up?
Will

Will,
Yes MSC don't like the bother of exporting off-shore due to US Government restrictions exporting technology to foreign countries. It seems they get enough business from home states (and Canada, Mexico) that they don't need to make the effort to filter the overseas orders to prevent high tech transfer.
With the US dollar the way it is at present, MSC is losing business.
Bevin

[wbleeker]

Will,
Yes MSC don't like the bother of exporting off-shore due to US Government restrictions exporting technology to foreign countries. It seems they get enough business from home states (and Canada, Mexico) that they don't need to make the effort to filter the overseas orders to prevent high tech transfer.
With the US dollar the way it is at present, MSC is losing business.
Bevin

Yes Bevin
Too right they are losing money, I would be only too happy to buy off them and the way our dollar is at the moment so would plenty of others!
Will

[neilw20]

Look at the UK link. It is not blocked.
MSC Industrial Supply Co.
Damn !! Expensive, aren't they!!
Stock levels, almost zero!! What service. Bet they get them from the US.

[JohnHaine]

Neil, I know this goes back a bit, but what inserts do you use please? I'd like to make one of these but a size smaller to do M14.

John (in UK)

[kstrauss]

Thanks for reviving an old thread! Neil mentioned that "The angular error in the thread form is trivial for most applications." Any suggestions regarding how this is determined? Web page perhaps?

[neilw20]

Neil, I know this goes back a bit, but what inserts do you use please? I'd like to make one of these but a size smaller to do M14.

John (in UK)

Triangular. You need to design around the smaller insert. Top of insert on centerline. Before use the front clearance angle needs a little grind or it won't work. I designed by first creating accurate model of insert, the position correctly on axis. Then the holder was modeled around it. The screw is moved 0.1mn back towards apex of triangle so the it pulls in firmly.

[Steve Seebold]

How hard is the material you’re going to be cutting? You might be better off trying to tap your holes.

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