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Messages - jimthefish

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1
General Mach Discussion / Spindle drive
« on: February 24, 2022, 12:06:36 PM »
Can someone give me advice, when running my spindle at 500rpm when I stop the spindle with M5 it still runs at 15rpm however at 800rpm I stop the spindle and it stops, go back to 500rpm and stop the spindle it creeps at 15rpm. I've had this for years and thought it was electronic interference but feel it might be something to do with my initial setting as checking the RPM with a strobe 500rpm gives 400rpm but at 800 rpm it gives me 800rpm. Any advice would be welcome as the only way to change the tools is to change the low revs programs to over 800rpm and introduce a tool change them put speed back to 500

2
General Mach Discussion / Re: What controls the main spindle drive
« on: February 22, 2022, 05:55:48 AM »
Hi John I always try to finally respond to those who help on the Mach forum. Decided to take out the LYNX board and have a look in clear light before committing myself to buying a new unit, well under the magnifier notice a broken wire on it. Soldered it back together and it all works. They quoted me £250 to refurbish it, not bad for soldering a loose wire, Thanks for your help, I've learnt a lot about spindle drives thanks to your input. Cheers mate.

3
General Mach Discussion / Re: What controls the main spindle drive
« on: February 21, 2022, 09:01:02 AM »
John your a star, been talking to transdrive, they said the same. There website has all the pictures and definitions of what's isolated and what's not wrong. He recommended the 680i which is isolated but the web page says its not. They are going to rectify the description and pictures. To add to my confusion the Denford manual says its a 500w motor and the label on the motor says 750w, so best to go big just in case

4
General Mach Discussion / Re: What controls the main spindle drive
« on: February 21, 2022, 06:29:24 AM »
Hi John just checked the brushes they are fine, the motor driving the spindle is a Lenze 0.75hp is the Sprint Electric 400i 0.55kW 4A is it man enough?

5
General Mach Discussion / Re: What controls the main spindle drive
« on: February 20, 2022, 06:08:00 AM »
Hi John, A bit about me before I start, I'm 76 a Brummie mechanical engineer who loves CNC but don't understand it.
I lecturer for 20 year in mechanical engineer and when I retired took the chance to buy a Denford Triac from the college.
I converted it with the aid of a mate to Mach 3 and have been using it for 12 years and apart from a failed contactor and several old computers that failed. its been faultless. Been making model steam train parts with it to stop me going senile
The machine is a Mach 3 conversion and I control the speed from the Mach 3 software.
Pin 3 comes out and goes into a spindle drive card on the main terminal board to the axis motors, stops, limit switches and emergency stop button. I noticed lately the spindle could be stopped by a cut that used to be no problem and the spindle speed does not maintain a constant speed through the day.
I purchase a Parker 508 off Ebay some 5 years ago but it looks like it will be going back on ebay.
I have noticed the first resistors on the Lynx board has burnt out but this was like it when I purchase the machine so ignored it.
Can I show my Ignorance as far as electronics goes, is the Sprint 400 board big enough as its rated at 4A.
John your a gent and appreciate all you have told me, its been invaluable.

6
General Mach Discussion / Re: What controls the main spindle drive
« on: February 20, 2022, 02:15:31 AM »
Hi John thanks for your quick reply, my Denford Triac is a 1988 machine with the spindle driven by a LYNX board, I've been told the Parker 508 inverter is a suitable match. The spindle stopped giving the selected speed then started hunting and finally stopped. I looked at the old LYNX board and found the inputs and outputs for driving the spindle and controlling the speed seem a straight replacement. But being an mechanical engineer if it don't move I don't understand it, electronics are a mystery to me.
Any advice would be appreciated.

7
General Mach Discussion / What controls the main spindle drive
« on: February 19, 2022, 06:39:19 AM »
I'm going to replace my spindle drive board on my Denford CNC but need to know what signals are given out by Mach to control the spindle speed. Everyone who knows me I'm useless at electronics so any advice is appreciated, the only thig I'm sure of its not gas regulation 3  :) :) :)

8
General Mach Discussion / Re: Spindle drive
« on: January 03, 2022, 06:57:56 AM »
Should add the power supply to the machine is 240v AC (UK) and the motor is 180v DC variable drive with 0 to 10v to control the speed.

9
General Mach Discussion / Spindle drive
« on: January 03, 2022, 06:22:20 AM »
I know its hard to believe but my original spindle drive control (Lynx 08) on my 1988 Denford Triac has finally given up. I know they don't make things to last however 33 years seems a fair deal. From my previous posts you can see I'm useless with electronics, if it don't move I don't understand it however the spindle started hunting up and down then stopped. So looks like i have to replace the drive card. I have a Parker 508 drive but not sure if its in working condition as I got it off Ebay some 5 years ago. Think Ill buy a new unit. Any suggestions as to the best ones to purchase at a reasonable price.

10
General Mach Discussion / Re: reset button not working
« on: April 30, 2020, 08:16:47 AM »
Bingo Tweakie, decided to clean up the workshop so started by cleaning swarf of the milling machine. Must have brushed too hard and disturbed a control wire to a limit switch. Thanks again for your help. Jim Fisher

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