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Thread: New 'Joe-Peter' collet blocks
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28th Jun 2017, 03:17 AM #1
New 'Joe-Peter' collet blocks
I may have invented a new ER collet block design. It was my original thought, but other may well have had the same thought - and I just can't find any evidence.
So here goes:
I decided to make some 'Stephenson' ER collet blocks. A four-sided and a hex one. to suit ER32 collets. Only I wanted the blocks larger in cross-section than the collet nut, so I could use them on the surface grinder - directly on the magnetic chuck, rather than in a vice on the magnetic chuck.
On a mill, however, when I thought about holding the hex block in a vice, I figured that either the sides were held in the jaws or the corners (with either a flat on the bottom or a corner). So in my mind, the corners should not be sharp. Then I figured that the corner 'breaks' could be machined to be parallel to each other to facilitate locating and holding in a vice without damage. The next thing that came to mind was "why not make the machined corners the same width as the flat?". And then it struck me: with a twelve-sided (duo-decagon) block profile, you don't need a square profiled block at all!
I ran the idea by my friend Peter, who thinks like I do and we share equipment and shed time. We decided that we'd make two - one for each of us to evaluate and use.
So here we go with a proof of concept:
IMG_20170625_135132 (Large).jpg
Raw (mystery steel - but tough) stock
IMG_20170625_234901 (Large).jpg
Turned to size then milled into duo-decagon shape in rotary table
IMG_20170626_230715 (Large).jpg
Ground flats
IMG_20170627_173452 (Large).jpg
Cut in half to make the two blocks
IMG_20170627_233353 (Large).jpg
Drilled and bored to roughly 26mm,
then threaded for the first ER32 nut thread
IMG_20170628_000658 (Large).jpg
Nut attached.
What do you think so far?
Next step is getting the second block to this state, then boring and grinding the 16 degree tapers for collets.
Photos coming when done - maybe later in the week.....Cheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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28th Jun 2017, 03:49 AM #2
Nice one Joe ! I like that idea.
Best Regards:
Baron J.
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28th Jun 2017, 04:26 AM #3
Thanks Baron. I'll post how they work in use when done. The proof is in the pudding......
I should be able to machine or grind one, two, three, four, six and twelve sided objects, plus eight-sided using V-blocks. I'll try.Cheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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28th Jun 2017, 09:01 AM #4Most Valued Member
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I think they look great, my only hesitation is in making them so wide they would be difficult to keep a hold of in shallower vices. This wpuld probably be more of an issue with er40 than 32. Look forward to more progress!
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28th Jun 2017, 10:42 AM #5Philomath in training
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Co-incidentally, you'd never guess what I made up yesterday...
You probably don't need to grind the tapered bore. The collet chuck I made for my lathe is only MS bored out on the lathe and is coping quite well after many years.
I did think about making mine big enough to clear the (ER40 = 63mm) nut but started getting into a 'where do you stop' loop. Heavier too. As my grinder chuck is only 4" wide, by the time the holder was located across the table I would not have much room left to grind. If I needed to do that I was going to get a solid bit of plate and hang that over the edge of the mag chuck so clamping was done off table and allow the workpiece to be over the chuck.
Michael
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28th Jun 2017, 12:21 PM #6Pink 10EE owner
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Here is a 12 sided ER40 one I made back in 2010.
Due to the small clamping surfaces it tends to move unless squashed very tight.
dividing chuck 003.JPGGold, the colour of choice for the discerning person.
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28th Jun 2017, 01:14 PM #7
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28th Jun 2017, 01:18 PM #8
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28th Jun 2017, 07:14 PM #9Philomath in training
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For the record -
P1040150.JPG
Flats on this one are 28mm wide.
Michael
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28th Jun 2017, 09:28 PM #10
Nice work Michael!
I give you 'permission' - and I suspect R.C. would too - to mill off the six edgesCheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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29th Jun 2017, 12:22 AM #11Diamond Member
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3rd Jul 2017, 12:40 PM #12Most Valued Member
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3rd Jul 2017, 10:21 PM #13
Thanks. We've finished them both now, but I'm away from home and can't try it or send photos until the weekend....
Cheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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5th Jul 2017, 07:26 PM #14
Are the skinny flats going to hold on a mag chuck??
I'm predicting a small batch should be run off.…..Live a Quiet Life & Work with your Hands
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6th Jul 2017, 09:03 AM #15Most Valued Member
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