Engraving depth by spindle speed not Z height

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paolo8453
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Engraving depth by spindle speed not Z height

Post by paolo8453 » Thu Feb 01, 2018 4:45 pm

Is it possible on a Roland machine? Can the spindle react quick enough to rapid changes in speed?

For the sake of argument I'll say I have a spring loaded spindle that gives a constant positive pressure on the work surface. As I move along the surface at a constant speed I will get a very faint line - if I start the spindle at 50% I'll get a 50% depth - at 100% I'll get full depth.

It would be similar NC code to how a laser would work I suppose - only with spindle speed being controlled instead of laser duration.
Hardware: TS-400 which seems to be the same as an EGX-400/600...

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mrtn
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Re: Engraving depth by spindle speed not Z height

Post by mrtn » Thu Feb 01, 2018 6:10 pm

Not really. The DC motor is not powerful enough to react to such a change.
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paolo8453
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Re: Engraving depth by spindle speed not Z height

Post by paolo8453 » Thu Feb 01, 2018 6:35 pm

I'm not sure what you mean? Would a different motor react faster?

Lets pretend I am cutting fresh air. I'm just wondering how quickly a motor can respond to a speed change maybe between 9000rpm and 10000rpm and back again on each line of code.

My lowly TS-400 can be told to change the spindle speed with the !RC command but there's a serious lag in speed change. Is there any other way to do it?
Hardware: TS-400 which seems to be the same as an EGX-400/600...

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mrtn
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Re: Engraving depth by spindle speed not Z height

Post by mrtn » Thu Feb 01, 2018 8:54 pm

That’s exactly the lag I am talking about, it does not have the torque to increase spindle speed while cutting at the rate your application requires.
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paolo8453
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Re: Engraving depth by spindle speed not Z height

Post by paolo8453 » Thu Feb 01, 2018 10:22 pm

Any suggestions for motors that can so this?
Hardware: TS-400 which seems to be the same as an EGX-400/600...

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mrtn
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Re: Engraving depth by spindle speed not Z height

Post by mrtn » Thu Feb 01, 2018 10:56 pm

You can upgrade to any spindle that fits the mounts or customize your own.

I haven't done it myself.
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