making Er16 collet chuck

[dovidu]

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

[olderdan]

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.