[teilhardo]

Hi All,
I just made a page to do a simple spindle control for the xylotex controller and turbocnc
It is on the bottom of my webpage

http://www.teilhardo.com

and titled "spindle control"

Good luck,
Tei

[yukonho]

Thank you very much, how timely.
Great job, I am going to put it to use soon.
co

[teilhardo]

Glad I can help. Let me know if you find any errors, I will be sure to fix them.
Good luck, its so exciting to walk out on the machine, come back an hour later and have the part cut out and the spindle off (if you don't find yourself hypnotized by the hum of stepper motors)
-Tei

[pack rat]

I checked out your website. It is neat and well organized. Nice work with spindle controll.

[yukonho]

Hmmm. I posted here yesterday and it is gone.
I can not get this to work. I have e-mailed jeff at xylotex, and have received a couple of replies, but no real solutions yet. The problem is that all of the outputs run directly from the printer port, and the most you will get is about 2.9V, I have no idea how you can trigger your relay with a resistor in line, that would bring it down to less than 1V.
Please advise.
thanks
co

[teilhardo]

Hi Yukon,
Check the voltage running from your parallel port. Is it >3 volts?
As far as I know, most computers use the CMOS standard 5 volts. The resistor that you attach shouldn't effect the voltage, just the current. In otherwords:

PPort _____________
(+5V) ------\/\/\/\/---------|+5Vin
300ohm |
| Relay
|
Ground ---------------------| 0V in
(0V) |_____________

if you only get 2.9 volts, you'll have to get a relay with a lower Vin value.
I hope this works

-Tei

[teilhardo]

Sorry the schematic got a little messed up when the message got posted


From PPort
(+5V) ------\/\/\/\/---------|+5Vin

(Ground)--------------------|0V in

[yukonho]

I got a different reply from Jeff at xylotex.
Very confusing indeed.
I will wait until my SSRelay arrives and give it a go.
Thanks
co

[ger21]

Yukonho, you might want to look here:

http://www.timgoldstein.com/cnc/parallel.htm

or here:

http://www.dakeng.com/relay.htm

or here:

http://ourworld.compuserve.com/homep...wden/page6.htm

or here:

http://www.cs.uwaterloo.ca/High_Scho...RALLELPORT.doc

Gerry

[yukonho]

PERFECT!!!
Thank you very much, that has all the answers!
co

[yukonho]

Well I received my solid state relay and hooked it up and it works perfectly.
I dont understand why you put the resistor in line, it is not needed.
co

[teilhardo]

Glad it worked. The resistor is just to limit the current from the computer. Since SS relays have pretty low threscholds to turn on, I figured that I minds well not put to much strain on the computers power supply
-Tei

[yukonho]

One thing I notice is that there is still some AC going through the relay, probably because there is a little bit of voltage coming from the printer port even when it is low. I wonder if the resistor will help this. I dont think it is a big issue, it makes my dremel hum quietly but it does not have enough current to actually spin until the software turns it on.
co

[teilhardo]

Thats strange...It shouldn't do that. Are you using a DC to AC solid state relay?

[yukonho]

Yup, Got the one from Stepperworld (I believe)
DC 3-32V to AC solid state opto isolated relay
co

[keithorr]

What is the current of the leakage? I have SSRs and Zero Crossover Rectifiers in my shop. They all "leak", but the current is very low. Touching a bare wire downstream of an off state 240 v SSR gives a slight shock, like sticking your tongue on a 9 volt battery. It's normal to get a volt reading in the off state.

[yukonho]

I dont have the equipment to measure the current, but the voltage without the dremel attached approaches 115V (line level), with the dremel attached the voltage drops down to 30V.
It is acting kind of funny now too, when I activate the spindle from the software, the spindle does not turn on, if I manually spin the collet, or move the speed control, it comes on.
Any explanation of this?
Thanks for your help.
co

[teilhardo]

That does not sound like an SSR problem. I have had the same experience with my dremel. I figured out that the brushes that are made for the armature are not to well made and tend to wear out pretty quickly. I guess it could be the SSR, some phenomenon on am not well aware of. Try new brushes
Good luck,
Tei

[yukonho]

Going to try a new spindle soon enough, but I will take a look at the brushes. Thanks
co

[ki4aoa]

yukonho:

Just a thought, the humming you were describing would be hard on the brushes. (atleast in my simple mind) What are the voltage of the 5 volt input of your ssr when it is in the off state?