making Er16 collet chuck

**dovidu** · Mar 13, 2019, 08:23 PM

i needed an er16 collet chuck for my stepper motor.

purchased two from ebay: "er16 collet chuck motor extension"

i've had much luck with chinese tools, but this time... it was a terrible experience.

the specs said if i purchased 8mm ID for motor shaft, I would receive 7.98mm shaft so i could induction heat it, then put it on the shaft

however, i recieved 8.1mm oversized hole, so i couldn't use it... too much runout.

took over a month for it to arrive, wasn't going to wait again.

based on google and forums er collet chucks have 8 degree internal taper angle

my compound was not gonna have the accuracy required,

so i used a bevel protractor to get the precision within 0.1 degrees, which for ER collets is enough

even greater precision could be set, if i purchased electronic bevel protractor, but it would cost me over $600 for quality one.

i just went with vernier one, which wasn't too bad.

below is the link to the making vid of this collet holder

feel free to comment

**DIYer** · Mar 14, 2019, 04:12 AM

Thanks dovidu! We've added your Collet Chuck Holder to our Machining category,
as well as to your builder page: dovidu's Homemade Tools. Your receipt:

Collet Chuck Holder by dovidu

tags: holder, collet

**dovidu** · Mar 14, 2019, 06:04 AM

Originally Posted by DIYer

Thanks dovidu! We've added your Collet Chuck Holder to our Machining category,
as well as to your builder page: dovidu's Homemade Tools. Your receipt:

<div id="blocks"> <div class="block b1 pngfix"> <div class="bimg"> <div> <a href="http://www.homemadetools.net/homemade-collet-chuck-holder"> <img src="/uploads/222002/homemade-collet-chuck-holder.jpeg"/> </a> </div> </div> <div class="head pngfix"></div> <div class="left pngfix"></div> <div class="right pngfix"></div> <div class="blockover b1 pngfix"> <div class="title"> <a href="http://www.homemadetools.net/homemade-collet-chuck-holder">Collet Chuck Holder</a> <span> by <a href="http://www.homemadetools.net/builder/dovidu">dovidu</a></span> </div> <div class="tags">tags: <a href='http://www.homemadetools.net/tag/holder'>holder</a>, <a href='http://www.homemadetools.net/tag/collet'>collet</a> </div> </div> </div> </div>

thanks!~ hope folks enjoy this

**wizard69** · Mar 26, 2019, 11:03 AM

Nice video but you breezed by bore diameter measurements.

Curiosity is killing me here though, why an ER collet on a stepper motor? I’m thinking this will need a video all on its own.

Originally Posted by dovidu

thanks!~ hope folks enjoy this

Most enjoyable, watched right after eating breakfast. Nothing better for starting ones day than watching a bit of machining. Far better than the news or morning shows.

**olderdan** · Mar 26, 2019, 01:06 PM

Nice work and enjoyable video, for setting exact tapers and I mean exact with only a DTI have a look at Joe Pieczynski's channel here

it may help with future projects. I agree with your comments on chinese quality I purchased a cheap set of ER 20 collets and had to grind the bores of two of them to accept the nominal sizes. I would do it again but you do get what you pay for, at least you did not have to make the closing nut.