Hi from Glasgow

**Voicecoil** · 23-04-2020

Originally Posted by bartdietrich

The problem is that there is no way to attach the chuck to the motor shaft in a repeatable centred way: the two grub screws allow all sorts of tilted orientations because the motor shaft is thinner than the inside of the chuck. Do you know of any chucks with some kind of reliable attachment systems?

Bart

From this statement it sounds like the problem is the attachment bit of your chuck - to have any chance of good centering the hole that the motor shaft goes into is going to need to be an extremely snug fit. I've had a wee search and like you not had much success with finding an ER11 chuck with a 3mm shaft entry. I did however come across one or two motors with ER11 chuck fitted that look like they might fit your machine on the Bay of fleas for quite reasonable money (£18....25) - might that be a way to go?

**bartdietrich** · 26-04-2020

Originally Posted by Voicecoil

From this statement it sounds like the problem is the attachment bit of your chuck - to have any chance of good centering the hole that the motor shaft goes into is going to need to be an extremely snug fit. I've had a wee search and like you not had much success with finding an ER11 chuck with a 3mm shaft entry. I did however come across one or two motors with ER11 chuck fitted that look like they might fit your machine on the Bay of fleas for quite reasonable money (£18....25) - might that be a way to go?

Indeed, I don't think my current chuck is worth me spending any more time on trying to fix it. What keywords did you use for the eBay search? Can you post a link to one of the results you found? The ones I've seen all seem too big. I need a motor of 29 mm diameter and the mounting holes need to be 22 mm apart. Since I don't have the capability to machine my own motor holder I am pretty much stuck with the hardware that came with the mill. I'm toying with the idea of getting a Ooznest WorkBee milling machine. I could use that to make a motor holder for a different size motor for the PCB mill (not just for that, it would complement what I can do with the 3D printer and would come in handy for work too), but that's just a vague plan for sometime in the future. So for the moment I'm stuck with that size of motor for the PCB mill. Speaking of which, any opinions on the WorkBee?

Bart

**Doddy** · 26-04-2020

Originally Posted by bartdietrich

Indeed, I don't think my current chuck is worth me spending any more time on trying to fix it. What keywords did you use for the eBay search? Can you post a link to one of the results you found? The ones I've seen all seem too big. I need a motor of 29 mm diameter and the mounting holes need to be 22 mm apart. Since I don't have the capability to machine my own motor holder I am pretty much stuck with the hardware that came with the mill. I'm toying with the idea of getting a Ooznest WorkBee milling machine. I could use that to make a motor holder for a different size motor for the PCB mill (not just for that, it would complement what I can do with the 3D printer and would come in handy for work too), but that's just a vague plan for sometime in the future. So for the moment I'm stuck with that size of motor for the PCB mill. Speaking of which, any opinions on the WorkBee?

Bart

If only you could find a forum where people had such machines that could cut something for a different sized motors :(

Don't let the diameter unnecessarily constrain you. I would offer some assistance but I've... erm... had a bit of an accident with my mill and am waiting a delivery from China. Just don't throw a lot of money at that machine.