Why no ER20 collet blocks

A simplified approach to a DIY collet block is to use one of these.
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US Stock C16 ER20A 100L CNC Lathe Milling Holder Shank Chuck Collet 16 x 100mm | eBay

C16 ER20A 100L CNC Lathe Milling Holder Straight Shank Chuck Collet 16 x 100mm. Model: C16 ER20A. Length handle：100mm. Extended straight shank type handle, with longer handle body. Suitable for deep hole processing，to solve extend depth of processing need.
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Bore a suitable hole through Your square or hex block and fix the collet chuck with a set screw.
 
I think the er20 is most commonly used to hold tooling, less for holding parts. Therefore no collet blocks.
Size does matter.
 
shootin-blanks said:
I bought a set of er20's for my Maximat 7 lathe/mill. along with a MT2/ER20 collet chuck.. 1/2" max size seemed as the right complement to it.
Then I see a "collet block".. and thought, that might be handy.. but no one makes one.
Click to expand...
I did the same for my Prazi mini mill.

I figured the ER20s only going up to 1/2” would keep me and future owners of this mill out of trouble s as 1/2” in the max recommended end mill size for this.

Then I wanted a plain back ER20 collet chuck and was SOL.

I did find a router chuck with a boss on the back though and this is on my someday list to turn y to he boss off and mount it to the spindle.
 
woodchucker said:
I think the er20 is most commonly used to hold tooling, less for holding parts. Therefore no collet blocks.
Size does matter.
Click to expand...
My Tormach CNC uses the TTS ER20 tooling system. I use it almost exclusively for tool holding. With a 13mm capacity, it isn't too useful for work holding and I have a 5C chuck for my lathe so there isn't a need to use it there. I also have two RT's so if I need to cut a square or hex on some round stock, I can take that approach rather than using a collet block.
 
I have ER32 collet block in square and hex and I find Ive used it on the lathes to hold small parts , threaded bolts etc . I think RJSakowski link would be a wonderful addition , like it is you could make a square and hex to slip on the shaft a set screw could hold them on , the stright shaft could slip in a 3 jaw or a four jaw and indicated in ( which I do for precision work ) for the price its worth it even if it’s only used a few times
 
My solution - I have 1/2" shank holders for my smaller ER collet sets. I can then use really common 1/2 collet stuff to hold that. It's not perfect but gives me a lot more range of (small) stuff I can hold in my Deckel and 5c collet blocks.
 
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