Stent Tool Grinder

If one were to turn a groove both ends of the square/round thing before slitting it into 4 you could wind up a one turn ring from piano wire and spring it into the groove, one each end. This would hold it all together and in alignment.

That sounds a good idea, Duncan,

It would avoid for having to evolve a third hand!

Take up Rotary Broaching and then slit!

Another item to go on the Round Tuit!

Thanks

Howard

Edited By Howard Lewis on 22/12/2020 13:53:39

I really don't understand why people get fixated on making "collets" to hold square tools, other than the fact that designs like the quorn are designed to hold tools in circular fixtures. When I started making tool bits for my Diamond tool holder, I just made a little fitting that would replace the thingy that the collets fit in, it's a rectangular steel block with a short silver steel bar to fit in the workhead, and a slot milled out to take the tool blank with a couple of SHCs to clamp it. The Worden and Stent, and the Acute, are IMHO better adapted to holding square tools in easy to make holders.

I had a look at Mike Cox's web site and had a go at making one - but I made the rotary part out of a redundant revolving centre mounted in a mild steel block machined to fit on my QCTP. It incorporated the necessary angles in its flank and rear face. Photos and brief construction description in my album entitled Rotary broaching tool

Incidentally, I was the author of the article referred to by Howard, suggesting using various sizes of rods to hold square stock in round collets. In my defence and of those of us with only two hands, it was said in the article that it wasn't supposed to be a long-term solution to the problem, but a stop-gap, one off, temporary arrangement.

John

Holding square or rectangular pieces in the Worden is easy. I was thinking more in terms of being able to hold square workpieces in a collet for turning, to minimise the work needed to set it to run concentric.

So this is the wrong place to have that particular discusion.

Howard

Fair enough, Howard. I wasn't having a go at you or anyone else. Too late to edit my post, so please ignore it.

John

No offence taken, John.

Just that I am very prone to taking threads off topic!

Actually, collets are far less used in the lathe than chucks. Collets are far more often used for work holding or trying to sharpen drills.

See? He's at it again!

Howard

ER Tap Collets...

Weston Tooling ER Tapping Collets

Also available elsewhere I'm sure..

..I guess you'd only need to buy em' once..

Edited By DiogenesII on 22/12/2020 16:33:19

If you know someone with an EDM machine it would be easy to make an ER collet to suit !

Not a daft question. Why do you want one?
if you go onto the Bristol model engineers site they do a very simple cutter grinder that I made and sold recently as I can no longer work. It was featured in MEW no 47 and called the Collier Caseley. No castings needed,made from stock materials, driven by 1/8 hp motor and diamond cup wheel. 2, 3 and4 flute cutters can be sharpened ON THE END only - never had the need to do the sides.
I have pics but cannot get then onto this site but can email if you contact off line.

pete

As mentioned by Pete above. two more pictures in my album. If you have half a brain you can see how it works and make the equivalent out of whatever you have to hand. The tool is swung across the wheel similarly to a Quorn.

To be fair, I trawled the BSME site and couldn't find peter's grinder.

Hi

go on site, page “ post and news” right hand side of page in yellow. Enjoy pete

Hurrah. I found out howto.

I made this some 10 years ago

pete

This might help:

Link

Hi Guys,

Peter asked me to put these pictures on the forum for him of his Collier Caseley. TCG,