If by shim, you mean the 3d printed spacer used to fill out the Dewalt mount here is a couple pictures.
I do not remember the thickness of it. It was hard work putting it on the Makita, but the whole thing slid easily into the dewalt mount afterwards. A little bit of tightening the screws on the mount and good to go.
I’m not taking it off to measure it, that’s for sure
But I’ll see if I can get the measurements from the .STL file (it is linked to somewhere here on the forum )
I made a shim out of 2.75" aluminum pipe: http://www.amazon.com/gp/product/B00ARCNRTW — 16 gauge (~0.065", it was ~1.651mm thick) it would’ve been better at 2mm thick (if I could’ve gotten that to fit — still not sure if it would, and still debating about buying a 2mm thick pipe).
16 (0.0598, non coated) or 14 (0.0747, non coated) gauge was what I was going to look into. I think 14 gauge would be perfect as is just slightly under 2mm. I guess I’ll have to wait and see once my Makita gets in!
you could also buy a Extention Collet Chuck. but this works for me even whit 3000 rpm, if you go higher than 5000 rpm its better to have a perfect fitting cone shape.
Whit the makita and a R11 collet it’s clamped in the cone of the makita and you center it whit the nut
That angle doesn’t look to be the same as for the actual Makita collet, and I see wear marks on the collet, the likes of which my Elaire collets don’t show.
The Makita does not have an ER11A collet and using one will introduce run-out as well as being very dangerous.
Even at minimum speed (10k), I wouldn’t risk doing this.