Endmills with threaded shanks

[Grant T]

I recently picked up quite a bit of tooling, nice Kennedy tool box, some measuring tools Machinery's Handbook 28th edition etc.
I got his information from this forum on member spotted deals, thanks for that. That was from a retired toolmaker in West Kelowna B.C. He still has some tooling etc. for sale if anyone is interested.
Most of the endmills, there are a lot of them different sizes. They have threaded shanks, which I believe were popular in the UK and Europe, but not so much here.
My Question: Has anyone used them with a R8 collet with success. I have a RF45 Milling machine so plenty of power to use 3/4 size.
The gentleman said the shanks could be turned down on the lathe with carbide tooling.
Has anyone had any experience with these endmills.?
Thanks
Grant Topham Peachland

 

[YYCHM]

Post an image of these threaded endmills please....

 

[Doggggboy]

I recently picked up quite a bit of tooling, nice Kennedy tool box, some measuring tools Machinery's Handbook 28th edition etc.
I got his information from this forum on member spotted deals, thanks for that. That was from a retired toolmaker in West Kelowna B.C. He still has some tooling etc. for sale if anyone is interested.
Most of the endmills, there are a lot of them different sizes. They have threaded shanks, which I believe were popular in the UK and Europe, but not so much here.
My Question: Has anyone used them with a R8 collet with success. I have a RF45 Milling machine so plenty of power to use 3/4 size.
The gentleman said the shanks could be turned down on the lathe with carbide tooling.
Has anyone had any experience with these endmills.?
Thanks
Grant Topham Peachland

Maybe this would work for you.

http://www.homews.co.uk/page423.html

 

[Jswain]

Post an image of these threaded endmills please....

Also of the rf45

 

[Dan Dubeau]

I have used a lot of clarkson autolock cutters over the years in regular r8 collets. Mostly 3/8, and 1/2 (boss must have got a great deal on a big lot of them at some point). If you have a good deep 3/4" r8 that will grip the shank, and not the threaded portion you will be fine. I have some import r8 collets, that are not bored as deep as some hardinge ones I have, so beware. I wouldn't hold them on the threaded portion at all. If your collets won't take them deep enough, just cut the threaded portion off with an angle grinder. It's useless without an autolock holder/collet system anyway.

 

[Arbutus]

This is the Osborne/Clarkson end mill holder mounted on an R8 shank.

The collets have a locking tab to prevent rotation inside the chuck. The collets are also threaded which pevents rotation of the tool when properly seated. Inside the chuck are the male lugs and a centre which engages on the end of the cutter and guarantees exact axial positioning.

 

[Dan Dubeau]

One of the brits had one of the actual holders like that. The rest of us uncivilized hacks, just stuffed em in r8's lol.

 

[Susquatch]

My Question: Has anyone used them with a R8 collet with success.

I have quite a bit of tooling like that. As long as the threads are not rolled and higher than the shank, and as long as there is a decent length of unthreaded shank for the collet to hold onto, they have worked just fine for me.

Let's put it this way. If you decide you don't trust them, send them my way and I'll pay the postage.

 

[garageguy]

I've used some as well , without the technically correct holder, no problem.

 

[Grant T]

Thanks for all the info. My collets are bored all the way so the threaded endmill shanks will go all the way in to the cutter portion, so I will use them that way. I also have quite a few metric, most of which will not fit my collets very well, so I may try to turn the shanks down to a nominal size that I can use rather than buy a set of metric collets. Worth a try anyway. I tried to post photos but did not have any success at that.
thanks again
Grant

 

[thestelster]

so I may try to turn the shanks down to a nominal size that I can use rather than buy a set of metric collets.

I personally wouldn't advise it. Grinding down the shanks might not give you true running cutting flutes, and that can cause breakage and poor surface finishes. Better to buy cheap Chinese metric collets.

 

[Grant T]

Good point. I was wondering just how accurate it would be. Thanks for the input.
Grant

 

[thestelster]

Good point. I was wondering just how accurate it would be. Thanks for the input.
Grant

And you don't have to by a whole set of metric collets.

 

[RobinHood]

The collets have a locking tab to prevent rotation inside the chuck. The collets are also threaded which pevents rotation of the tool when properly seated. Inside the chuck are the male lugs and a centre which engages on the end of the cutter and guarantees exact axial positioning.

Plus, the cutters can’t move axially in the holder.



And a note to the operators…: (the cutter won’t go anywhere, what about your eyesight? [love those old tooling catalogues / instruction manuals…] )



SKF / Dormer had their own version of the “Autolock“ system called “Fastloc”. (R8 tool holder in the red box on the left).

 

[Dan Dubeau]

just get a cheap er32 collet holder with metric collets, instead of metric r8. A little more versatile for other things too.