Search found 21 matches

by firebrick43
Thu Feb 03, 2022 3:49 am
Forum: Centroid Acorn CNC Controller
Topic: Recommendations for PC to run p.m. 940 conversion
Replies: 185
Views: 21673

Re: Recommendations for PC to run p.m. 940 conversion

I just bought a M93 with ssd, mount, and optical drive on ebay for 100 bucks and an asus touch monitor for 80.
by firebrick43
Tue Feb 01, 2022 9:42 pm
Forum: Centroid Acorn CNC Controller
Topic: LENZE SMV VFD
Replies: 3
Views: 1148

Re: LENZE SMV VFD

Ac lenze drive are very good, i love mine. My guess is you are not setting Parameter P120, 121, 122, 123 correctly which controls how the start stop direction circuit works. 13 a b and c terminals on the drive are programable how they act by the previously mentioned parameters. And you do have your ...
by firebrick43
Thu Jan 27, 2022 8:03 pm
Forum: Centroid Acorn CNC Controller
Topic: Spindle Motor on PM-30MV Integration into Acorn
Replies: 21
Views: 4148

Re: Spindle Motor on PM-30MV Integration into Acorn

They don't actually have less torque because of less amps. VFD don't actually produce true ac wave forms. They take DC voltage(so do servo drives) and modulate the pulses in the mhz range very quickly and at the same time modulate the voltage in amplitude to form a representation of the AC wave form...
by firebrick43
Wed Jan 26, 2022 9:39 am
Forum: Centroid Acorn CNC Controller
Topic: Spindle Motor on PM-30MV Integration into Acorn
Replies: 21
Views: 4148

Re: Spindle Motor on PM-30MV Integration into Acorn

They draw nearly 19A at startup, do you need a 20A VFD to run them? Uwe No. VFDs are typically rated by horse power. You actually enter the numbers right off the motor plate into the vfd with "limits" its output to the motor itself. I had to look it up but a 2 hp vfd is putting out around...
by firebrick43
Tue Jan 25, 2022 10:01 pm
Forum: Centroid Acorn CNC Controller
Topic: Spindle Motor on PM-30MV Integration into Acorn
Replies: 21
Views: 4148

Re: Spindle Motor on PM-30MV Integration into Acorn

This Baldor is 1470€ in Germany.... https://www.raptorsupplies.de/pd/baldor/idnm3584t?acc_typ=rp_germany&campaign_id=11708732330&campaign_network=g&device=c&keyword=idnm3584t&matchtype=p&utm_source=google&utm_medium=cpc&gclid=CjwKCAiA3L6PBhBvEiwAINlJ9Nk9xl-a21IOtpo2m...
by firebrick43
Tue Jan 25, 2022 11:38 am
Forum: Centroid Acorn CNC Controller
Topic: Spindle Motor on PM-30MV Integration into Acorn
Replies: 21
Views: 4148

Re: Spindle Motor on PM-30MV Integration into Acorn

1.5kw is almost 2hp exactly. So a Baldor IDNM3584T motor, which is a 145TC frame is a 1.5hp motor. It has a pull up torque(load it can accelerate from a dead stop) of 9.1 ftlbs(12.33nm) and and a pull down torque of 19ftlbs(25.7 nm) Even though this is a 1.5 hp motor instead of 2hp its pretty close ...
by firebrick43
Mon Jan 24, 2022 10:13 pm
Forum: Centroid Acorn CNC Controller
Topic: Spindle Motor on PM-30MV Integration into Acorn
Replies: 21
Views: 4148

Re: Spindle Motor on PM-30MV Integration into Acorn

Well costs in Germany are different, but I compared new stuff. If I used chinese motor/vfd as well it would come much cheaper still, even new. I was using name brand drive and heavy duty American made motors. 2 pole 1.5kw 210€ Delta EL VFD 250€ SK30 Tapping holder 175€ collet 17€ each Tapping holde...
by firebrick43
Mon Jan 24, 2022 12:39 pm
Forum: Centroid Acorn CNC Controller
Topic: Spindle Motor on PM-30MV Integration into Acorn
Replies: 21
Views: 4148

Re: Spindle Motor on PM-30MV Integration into Acorn

After looking at your build, I have no doubt in the least bit that your cuts are smoother when you replaced your old motor. I have seen the same results in hanging a high quality motor/pulleys/good belts on a lot of machines. Its the balance, bearing quality, shaft runout, pulley concentricity and b...
by firebrick43
Mon Jan 24, 2022 11:18 am
Forum: Centroid Acorn CNC Controller
Topic: Spindle Motor on PM-30MV Integration into Acorn
Replies: 21
Views: 4148

Re: Spindle Motor on PM-30MV Integration into Acorn

In performance and weight also... Uwe In performance not so much unless you wish to do ridgid tapping or orient. Even 1000:1 vfd rated motors have a hard time down at 1 hertz or so. If your thread milling with a single point, or have a floating tap holder, then a servo has no advantage. There is no...
by firebrick43
Mon Jan 24, 2022 10:32 am
Forum: Centroid Acorn CNC Controller
Topic: Spindle Motor on PM-30MV Integration into Acorn
Replies: 21
Views: 4148

Re: Spindle Motor on PM-30MV Integration into Acorn

suntravel wrote: Mon Jan 24, 2022 9:50 am
tblough wrote: Mon Jan 24, 2022 9:22 am If you don't need spindle orient, then option 2 is the best as that is what Acorn (and all of Centroid's) controls were designed for.
Do you think it makes a difference for Acorn if it controls a VFD or a Servo drive in speed mode with 0-10V ?

Regards

Uwe
In cost it does.