Member postings for Thomas Dye

I see that continuous stream of chips and wonder how difficult it would be to add chip breaking in the g code?

Would definitely stop them building up around the tool.

I suppose it could be done by alternating the path or by over-boring the hole slightly first.

Ah, Sorry about that, I'll try and remember not to do that in future.

A proper speed controller, one that takes the measured speed of the spindle as feedback and adjusts the power of the motor accordingly would allow a high speed motor to be used a lower speeds without running out of torque. This approach is much more cost effective: a magnet and reed switch or even hall effect sensor (and microcontroller) are much cheaper than a 20kW motor.

EDIT:

Just realised you're probably talking AC motors with a VFD. In that case you may want to separate out the cooling of the motor, from the speed of the motor. Maybe have the speed controller controlling a fan and feed into the speed controller some degree of information about the characteristics of the motor and a way of estimating power dissipation, or directly measure that too/instead

Edited By Thomas Dye on 12/04/2018 20:03:19.

Edited By Thomas Dye on 12/04/2018 20:11:03

Edited By Thomas Dye on 12/04/2018 20:11:38

That thing scares me a little. As a cheap hack to get power feed working again whilst a proper solution is found it might work. One thing to check first is the creepage and clearance required at the voltages you wish to use.

**LINK**

If you buy it then maybe you could get someone to check the insulation resistance i.e. to the heatsink, since that should in some way be open to air and could therefore cause a safety issue.

My advice is not to buy that board.

As to a more permanent solution, someone called john fletcher says he has a copy of the Erskine PCB layout with all the component values: **LINK**

I can imagine his knowledge may be useful too, in checking what caused the fault. Don't want to buy something only for that to burn out too, because something else on the machine caused the fault.

Hope this helps.

Tom

Edited By Thomas Dye on 11/04/2018 20:42:31

New member. Looking to eventually acquire a lathe and/or milling machine, when I accumulate the budget, that is.