2+2+3 More Plasma builds, double the joy ! 3X2M and 2.5X1.5M cnc plasma build.

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27 Apr 2020 11:23 #165799 by rodw

why the expensive AL profiles not a cheep Square steelbody 3mm wall 2x2"


1. Weight
2. I bet Tommy gets it cheap!

3mm steel is way over kill and heavy!
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27 Apr 2020 11:55 #165806 by machinedude
not to mention the aluminum extrusion tends to be straighter. all the steel tubing is petty much welded so that throws stress into the material before you even get started. it would not surprise me to see 3 mm bow in a longer section or better.

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27 Apr 2020 12:00 #165808 by tommylight

why the expensive AL profiles not a cheep Square steelbody 3mm wall 2x2"


1. Weight
2. I bet Tommy gets it cheap!

3mm steel is way over kill and heavy!

1 correct
2 not at all, at 3.7 euro/kg and 3.9kg/m anything but cheap!
But in the machine cost, that is quite a small price for the gantry and all the moving parts.
Since this situation is causing a lot of trouble getting anything done, i do have 80X80mm metal profile outside rusting at 6m length, so i might just use that. I would not like it.

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27 Apr 2020 15:53 #165840 by tommylight
Here is a short video of the gantry moving at 55meters per minute, or at 2165.3 inches per minute !
I did not dare to push it further out of fear it would fly away ! :)
That is 1 meter distance it is passing in just a smidge above 1 second!
Acceleration is set at 1500mm/s/s, and this is possible using Mesa 7i92, Lam Technologies drives, an old beat up Lenovo laptop, and Sanyo-Denki 1.8A motors.

Regards,
Tom.
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27 Apr 2020 16:38 #165845 by tommylight
Surfing the gantry !
A failed attempt at doing just that, at such high acceleration it just throws me off on direction changes.
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27 Apr 2020 19:21 #165859 by rodw
Awesome tommy. Can you share the lam technologies part numbers? I see 2 different sized boxes. Is one of them a power supply? What voltage are you using for the steppers.?
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27 Apr 2020 20:04 #165864 by tommylight
Ds1044 and DS1076, mostly.
I have no words to describe how good they are, but pricey !!!
mechapro.de had a discount on those two models last time i ordered 7 of them.
www.mechapro.de/shop/Schrittmotor-Steuer...ehaeuse:::22_49.html
Still the lowest price i could find.
-
So the sensors are wired and working, done it's first homing and squaring.... about 200 times ! :)
While i was setting it up it was painfully slow, but after sorting it i raised the speeds, a lot! Makes for a fun thing to watch when 20cm from home, it's like "zip" done.
And just in case you order those, please be sure to order the programmer for them, it's 28 Euro, or you will be stuck at 1A and 2A respectively and at /4 microstepping. Been there done that ! First time i ordered them from an Italian website they never mentioned or suggested i might need that, i was stuck at default for nearly 5 months.

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27 Apr 2020 20:08 #165866 by tommylight

Awesome tommy. Can you share the lam technologies part numbers? I see 2 different sized boxes. Is one of them a power supply? What voltage are you using for the steppers.?

These are power supplies, bottom thingies, 3 of them, 400W each at 24V, wired in series for 72V to the big drives and 48 for the smal one. 1.2KW of power, add two more and i could use them for plasma cutting at 16.7A !!! :)
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27 Apr 2020 20:56 #165873 by tommylight
Sorry, forgot to attach the picture, to much math and everything...
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27 Apr 2020 21:23 - 27 Apr 2020 21:24 #165876 by rodw
Tommy, thanks. I also see that they have steppers listed there with encoders but Lam don't list them on their own site. NOr do they have drivers with encoder inputs I can see. So would you close the feedback in Linuxcnc if You went that way?

I was kinda thinking 4 NEMA 23's at around 260 oz/in 3 amps (say Lams M1233051), DS1076 drivers, 70-80 volts with 5:1 reduction drives on a rack and pinion drives should smash a light (say 30kg) gantry

And probably also do the same with a DS1044 on a 48 v SMPS

What do you think?

Or should I use a Toroidal and Lam's power supply modules?
Last edit: 27 Apr 2020 21:24 by rodw.
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