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Messages - Peter Homann

371
Hi Keven,

The stencils I use are made of brass or stainless steel. The thickness is 8 thou.

Cheers,

Peter,

372
General Mach Discussion / Re: Tormach OEM version
« on: June 11, 2009, 12:46:00 AM »
Hi,

I think that there is quite a difference. If an operator enters GCode that drives a Milling bit through the table, then one cannot claim a warranty repair.

If I had a Tormach, and I powered it up and the machine immediately drove the milling bit into the table I'd be wanting a repar under warranty.

Yes, the damage is the same in either case, but one is caused by faulty software, i.e. Warranty.

BTW, I haven't read the warranty agreement so don't know what it covers. :)

Cheers,

Peter.

373
General Mach Discussion / Re: Tormach OEM version
« on: June 10, 2009, 10:01:24 PM »
Hi,
As I understand it, the issue of voiding the warranty is that the Tormach OEM version has been fully tested and has been configured to suit the machine.

If you use the latest development version of Mach and have a runaway situation that damages the machine, Tormach do not want to be responsible for any damage caused to the machine.

Seems fair enough to me.

Cheers,

Peter.


Thanks.

I would hope that changing software would not invalidate the warranty on the mechanics, but in any case, I did not read that in the docs, and I won't go looking.

BH


374
Ok, I'm not sure I understand the math, but I appreciate the help. Peter what should I widen it to?

Basically a wide slot is good. A 1/2" slot seems reasonable. As Rich suggested, try 1/4"  There is no use trying to find the minimum you can get away with because it may fail if you go to 2200rpm, etc

In the end Mach3 looks for the transition edge, once if detects that the rest of the pulse is unused, so to Mach the width of the pulse is not important, it just needs to be long enough for it to be detected.

If you are worried about the balance of the disk, you could drill a hole opposite the slot (But not where the sensor will see it)

Cheers,

Peter.

375
2000 rpm = 33.33 Hz

therefore 1 rev takes 1/33.33   or 30ms

At the diameter you are using, the circumference is 2.875" X PI = 9.03"

your slot is .125"  = .125/9.03  x100  = 1.38% of the circumference.

So your slot is visible for .0138 x 30ms = 0.414ms or 400uS


You need to ask CNC4PC what is the rise and fall times of their index board, not just the opto sensor.

Then, for Mach3 to be able to see the slot it needs to be sampling at around twice the frequency. 1/400uS  x 2 = 5000Hz

So with mach at the lowest kernel speed of 25KZ, sampling the slot is not the issue. My assessment is that the slot is not wide enough and that the pulses exiting a the index board are non existent or too narrow.

You could make the slot wider to solve the problem or ask the manufacturer why it doesn't work.

Peter.

376
Hi,

It sounds like the slot is too small and the pulse is no long enough to be measured by Mach. It could also be that the sensor is too slow to respond to the short time the slot is exposed at higher rpms,

Cheers,

Peter.

377
First question, how are you communicating with your PLC

Cheers,

Peter.

378
SmoothStepper USB / Re: Which BOB for the smooth stepper
« on: May 16, 2009, 06:22:00 PM »
Hi All,
Appreciate the additional questions and replies as i have been "kind of" looking at BOB's.
A rock solid BOB  "without gremlins" is worth the elimination of possible aggrivation even at a increased
price. Not passing judgment, just trying to gain knowledge for down the road decisions.
RICH

Hi Rich,

Whether you use a BOB with opto-isolation, is a decision that is made when looking at your system as a whole. If you have stepper drivers that already have opto isolation, then an opto-isolated BOB is likely to introduce problems.

If you are using opto sensors on inputs, then again you don't really want an opto isolated BOB. If your input switches are mechanical, then opto-isolation is good.

So in the end it depends on what other components you plan to use.


Cheers,

Peter.

379
General Mach Discussion / Re: Digispeed DC-06
« on: May 16, 2009, 06:14:17 PM »
Hi rey,

I havn't contacted Peter yet. However I was right about one thing "done something stupid" :-[ :-[ :-[

Well not so much as stupid but I swapped the link selecting rising or falling edge and all works OK. Didn't see anything in the manual about it though.

All working a treat now.


ATB

Deker



Hi Derek,

Glad to see it is working. The manual does talk about JP1 in a couple of sections. Obviously it is not clear enough. I'll look at updating the manual.


Cheers,

Peter.

380
SmoothStepper USB / Re: Which BOB for the smooth stepper
« on: May 16, 2009, 02:57:08 AM »
That's a nice looking BoB Peter.  ..    Nice price too!
Checked the link, not much description there. Pretty straightforward.
Is there a pdf for it ?
Can you explain the "few other features" mentioned above ?
Can see the 5v or 0v common, 2-9 as IN or OUT and optional ENABLE.
Also, what is the shipping to USA ?
Thanks,
RC




RC,

The BOB has 2 enable inputs, one for a logic hi enable and 1 for a logic lo input. Either one will enable the BOB.

The BOB inputs and outputs have pullup resistors. You can set wither they are pulled hi or lo depending on your setup. 

The Common jumper allows you to set the common pins to either 0V or 5V depending on your drives, etc.

The D2-D9 jumper allows you to set the parallel port pins D2-D9 to inputs. This is useful for when you are using a 2nd BOB connected to a 2nd parallel port.

The BOB has a USB connector so you can  power it off your PC if desired.

Shipping to the USA is about US$15.00


Cheers,


Peter.