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Author Topic: Spindle speed control  (Read 8597 times)

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Offline Graham Waterworth

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Spindle speed control
« on: January 15, 2006, 10:38:08 AM »
Hi All,

My lathe has a variable speed controller that is operated by a rotary resistor that has a value of 4K7, my question is, can I connect the wires from the speed control into the parallel port without any other resistors.

Also it has a collar round the spindle with slots in and a infra red detector with 3 wires from it, can I also use these for the pulse count.

Thanks

Graham.
Without engineers the world stops
Re: Spindle speed control
« Reply #1 on: January 15, 2006, 11:11:31 AM »
I don't think you can hook them in...
Fixing problems one post at a time ;)

www.newfangledsolutions.com
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Re: Spindle speed control
« Reply #2 on: January 15, 2006, 01:11:33 PM »
The voltages on the speed control pot are floating at AC line voltage. Connecting them anywhere without isolation will make a big bang and incinerate things. Lookup Digispeed for more info, I think Campbell is also working on a similar unit.

The optical pickup could be electrically compatible if it was disconnected from the lathe electronics and only hooked to the computer, however you would need to change or modify the slotted wheel on the spindle since Mach is expecting a single pulse per spindle revolution.

Pete C.

Vmax

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Re: Spindle speed control
« Reply #3 on: January 15, 2006, 02:56:51 PM »
Graham, I have use Bob Campbells board and it works very very well. (have not test the digispeed yet) I believe the multi pulses will work you just have to tell mach How many per rev. Also a while back Art gave me an alternate hookup for multi pulses I'll look up the notes and see what it was. Terry

Vmax

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Re: Spindle speed control
« Reply #4 on: January 15, 2006, 03:08:03 PM »
Graham, Here is the note from Art

>
> > Terry:
> >
> > Most have found one is good enough. 36 may work just as well
> though, if
> > you use the 36 per rotation, feed them into the timing input, not
the
> index
> > input..
> >
> > Thanks,
> > Art

My Boxford lathe has two sets
1 is 1 PPR
2 is 36 PPR.   

I know 1 works ok and am still experimenting with 36.  (:~)= Terry

Offline Graham Waterworth

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Re: Spindle speed control
« Reply #5 on: January 15, 2006, 05:22:57 PM »
Sorry folks, I may have been economical with the facts here.

The spindle is DC drive

The drive card is a :-

KB Electronics KBLC-240D (4771B)
Input 115/230 VAC
Output 0-90/180 VDC
Rated 6.0 ADC

I am asking the questions as the KB Elec. site seems to be off line, so this is making it very difficult to fine any data on this unit.

The only site I can find with anything like it is Chinese and I am not fluent in Chinese or Googles translated gibberish.

Thanks

Graham.
Without engineers the world stops
Re: Spindle speed control
« Reply #6 on: January 15, 2006, 06:24:43 PM »
The speed control pot on that drive is *definately* floating at AC line potential i.e. 120VAC. In order to control these drives from Mach or other software you need an interface that provides both isolation and conversion of the signal from the computer into a control voltage for the drive. Below are two commercial options.

http://www.homanndesigns.com/DigiSpeed.html

http://www.campbelldesigns.com/mach-spindle-speed-control.php

Pete C.

Vmax

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Re: Spindle speed control
« Reply #7 on: January 15, 2006, 08:05:01 PM »
Graham the KB website is up !!!! Just came from there Do you have a KBLC or KBIC board?

Vmax

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Re: Spindle speed control
« Reply #8 on: January 15, 2006, 10:47:23 PM »
Graham, I looked and I have a D&M mill that uses the same style controller
KBLC-240DS the speed control part of it that hooks to the control board appears to run off of 0-7vdc. I measured it and referenced the manual. There is also several ways it can be controlled with a pot so please check with KB to be sure. It will still take a control interface board such as has been mentioned to make it work. The Campbell board has an adjustable output so you can tune the control to calibrate your RPM.

(:~)= Terry 

Offline Graham Waterworth

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Re: Spindle speed control
« Reply #9 on: January 16, 2006, 04:33:45 AM »
Hi Vmax,

It is a KBLC 240D (4771B) board.  I will try the KB Electronics site again.

Graham
Without engineers the world stops