Messages

201

General Mach Discussion / Re: Mach3 turn atc

« on: September 09, 2012, 08:07:10 AM »

unlike the smaller denford lathe atc, boxford use a stepper for rotation. If you have a datum you can tell the motor to go 45 degrees plus a small amount to clear the pawl, then reverse a few degrees until it locks again. If you do this move in incremental mode you don't have to worry about missed steps when it locks on the pawl when you reverse the stepper..

202

General Mach Discussion / Re: Emco VMC100

« on: August 25, 2012, 04:25:38 PM »

pop some pics up of the electronics, so we can have an idea what's used.

203

General Mach Discussion / Re: Component Identification Help

« on: August 24, 2012, 05:32:07 PM »

http://www.mycncuk.com/forums/general-electronics/4930-very-sick-lenze-534-controller.html

this thread may help

204

General Mach Discussion / Re: Denford Microrouter V3 conversion to Mach3

« on: August 23, 2012, 12:11:53 PM »

you'll also need a 0-10v isolated analogue signal to drive the sprint spindle drive. DIYCNC do an SP4DC which does the job well.

205

General Mach Discussion / Re: Denford Microrouter V3 conversion to Mach3

« on: August 23, 2012, 12:09:59 PM »

that's more or less it, you can use servo leads for the connections or buy a 96way header.

206

General Mach Discussion / Re: BT30 spindle from scratch - with power drawbar and ATC of course

« on: August 21, 2012, 11:45:35 AM »

you just replace the existing relay with a douible pole relay and use the second set of contacts to isolate the drawbar air solenoid.

207

General Mach Discussion / Re: BT30 spindle from scratch - with power drawbar and ATC of course

« on: August 21, 2012, 11:00:06 AM »

Denford use this on their spindle interlock to keep the door closed when the spindle is running.

208

General Mach Discussion / Re: BT30 spindle from scratch - with power drawbar and ATC of course

« on: August 21, 2012, 10:43:10 AM »

There is that functional issue, certainly, but what I am focused on is preventing the adapter from being ejected unexpectedly at 7,000 RPM with a sharp tool in it. I am beginning to get the impression now that a safety interlock is a foreign topic.
[/quote]

then my earlier reply will sort that.

"the relay that enables the vfd/spindle drive can be used to isolate the solenoid operating the drawbar."

209

General Mach Discussion / Re: BT30 spindle from scratch - with power drawbar and ATC of course

« on: August 21, 2012, 10:18:30 AM »

ah i see it's the need for the spindle to be stationery for the drawbar to operate you'tre worried about. Add a tacho to the spindle and use this to operate a relay that disables the drawbar.

210

General Mach Discussion / Re: PWM spindle - Circuit advice

« on: August 21, 2012, 10:01:31 AM »

C1 to 47uf, or R5 to 47K