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Author Topic: Mach3 Problems - Rant!!  (Read 36929 times)

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Offline Hood

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Re: Mach3 Problems - Rant!!
« Reply #110 on: June 23, 2011, 06:22:47 AM »
Think your router will be well out of shape by then ;D

Hood
Re: Mach3 Problems - Rant!!
« Reply #111 on: June 23, 2011, 06:25:07 AM »
You need S-Curves and a rigid machine to get to those levels...

Offline Pinky

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Re: Mach3 Problems - Rant!!
« Reply #112 on: June 23, 2011, 06:30:40 AM »
Tempest Planner's S Curve works nicely, everything runs much smoother, so that might help upping the accel/decel , but very much doubt we'll get 1G hehe.

The machine is relatively sturdy, about 1.2tons and we still need to add about another 500kg's - 1Ton  by filling the legs with sand, which should make it even more rigid.
Re: Mach3 Problems - Rant!!
« Reply #113 on: June 23, 2011, 06:36:11 AM »
Hi Pinky

I mean S-Curves as in bell shaped acceleration/deceleration(Like an automotive camshaft if you look at those lift curves, it's the same thing and the only way you can move mass faster without increasing jerk), afaik mach3 doesn't support it and the tempest planner is a smoothing algorithm only. You should get well above 0.12G though.

Offline Pinky

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Re: Mach3 Problems - Rant!!
« Reply #114 on: June 23, 2011, 07:27:06 AM »
Agreed jrobson.

I've been moaning about a proper S Curve Motion Card to my manufacturer for ages already, trying to convince them that it's something we not only want, but REALLY NEED!

As for Mach3 and S Curve, does it really not support it, or does using a motion controller maybe bypass Mach3's commands?

Otherwise we'll have to go EMC2 as that supports S Curve afaik.....

Re: Mach3 Problems - Rant!!
« Reply #115 on: June 23, 2011, 12:04:32 PM »
Look in your motor movement profile in motor tuning, it's trapezoidal not curved.

On the EMC2 forum I've asked the question and this was the answer from one of the admins: "EMC2 does not, currently, do jerk limitation. (d3x/dt3) though there has been some talk of implementing it (so, no S-curves in accelleration)"

I don't expect to see it any time soon in either, but first see how many G's you can pull without picking up problems and then see if it's a problem not to have.

Offline Pinky

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Re: Mach3 Problems - Rant!!
« Reply #116 on: June 23, 2011, 12:23:46 PM »
Thanks for the info jrobson.

It would appear my max would be around 0.15g's as the jerk becomes too much and starts affecting the quality of engraving :(

I've looked around and it appears as if a lot of people are using the Galil Motion Controller with their Mach3 setups.

Since my Delta Servo drives has S curve functionality built into them, would it not be possible to use that by connecting it to a Galil Motion Controller? Or does Mach3 negate that by using it's own "motion" ?

Offline Hood

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Re: Mach3 Problems - Rant!!
« Reply #117 on: June 23, 2011, 12:30:55 PM »
I would think with Mach doing the trajectory planning the Galil would be trapezoidal when used with Mach, cant see how it could be anything else.
Hood

Offline Pinky

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Re: Mach3 Problems - Rant!!
« Reply #118 on: June 23, 2011, 12:38:51 PM »
hehe figured that would be the case Hood, was just hoping for a small miracle ;)
Re: Mach3 Problems - Rant!!
« Reply #119 on: June 23, 2011, 01:09:02 PM »
Thought it would be better than that...