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Messages - BluePinnacle

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Tangent Corner / Re: making a snail...
« on: May 29, 2010, 06:37:31 PM »
Somewhere in my vaults of useless info, i have the info and file for creating a scroll based on ratios similar to what you
posted. It came from one of the engraving sites.  Where is your's from?

As far a snails are concerned i just put salt on them!  >:D

no, garlic and pepper!

General Mach Discussion / Re: Wiring of 2 wire proximity switch
« on: May 29, 2010, 03:01:40 PM »
^^ true. I used the optos mainly because i had dozens of them around due to the MOQ i had to put up with ( I used 5 on the rest of the machine). My setup uses a seperate power supply for the 9v circuit. Plus I have a really good system for making PCBs of my own.

my philosophy throughout was to use optos wherever possible, and keep the computer's ports attached to nothing but opto outputs. Maybe over-cautious, but actually no more expensive than the alternatives ;)

General Mach Discussion / Re: Wiring of 2 wire proximity switch
« on: May 29, 2010, 02:13:13 PM »
These look a great deal like the magnetic proximity switches on my Excel mill. They change resistance based on the proximity of a steel vane. I used a transistor/optoisolator circuit which I'll share when I get home. the optoisolator has a darlington pair output which provides an extremely rapid rise in output current when triggered. this is the setup currently used on my mill, it costs a few punds to make and the PCB is about 1.5" square :) it's a very accurate setup by the way - Well worth keeeping those switches.

that may be an issue. I never got to working out how interrupt requests actually worked. Presumably sharing an IRQ number would cause problems, but is there a way to pioritise interrupt requests, one over another - ie set the paralell cards to one number, and the USB ports to another (lower?) figure?

Is this to be a permanent setup? if so, just program X and Y as usual, Z as quill axis, and use A axis for the knee. sound suitable? I far prefer hardware solutions to this sort of thing.

rapids now up to 2000 mm/minute with no lost steps. No wireless parts involved. Still stumped.

General Mach Discussion / Re: Three LPT Ports
« on: May 24, 2010, 08:39:23 AM »
how about a wireless keyboard?

Hi Hood, thanks for the suggestions.

Sorted it ... it was a fresh install, and the parallel boards i was using beforehand (MosChip items, very robust).

the problem turned out to be USB things again - I could make it crash by scooting the mouse about. It seems WXP prioritises USB demands over anything else, legacy ports in particular, and therefore any USB activity (even routine polling for changes) causes a machine crash.

Solution: disable all USB systems and use a PS2 mouse and kb. While I was there I stripped out the soundcard, network card and usb PCI card. This releases a lot of memory and lowers the amount of possible interruptions.  That done, it now interpolates helical paths at 1800 mm/min with only 24% buffer load. I think it could go a lot faster ;)

this USB thing has been a persistent problem ... any ways round it?  occasionally I need to get things on or off the mill.

Trouble at t'mill! I replaced the computer after the frost killed the old one off, and now it really won't play.  ???

It's a faster computer (1.5ghz Athlon over the 900mhz Pentium) and when jogging, with a 45khz kernel, it will easily drive at 2000 mm/min plus. However when executing G-code commands the buffer instantly exceeds 100% and the pulse train goes nuts, causing severe amounts of lost steps. I'm down to about 1200 mm/minute maximum now, and when executing a long, slow helical move it still loses steps, and the steppers thump and stumble.

Any common reasons why this would happen? I'm going to be in trouble if I can't get the beast dancing nicely, so any help offered would be sincerely appreciated. Thanks in advance :)

Show"N"Tell ( Your Machines) / Re: My Big Project am I crazy
« on: March 04, 2010, 04:54:10 AM »
Awesome machine! what a catch. I'd be interested to know how the spindles are physically arranged. Would you provide pictures of these? I've never seen a big multi-spindle arrangement like this up close but I'd love to given the opportunity. :)

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