Desktop size steel welded router 3 axis

[Clive S]

Tom it looks like you could increase the acel settings. Have you thought about putting a W.C spindle on it?

Nice machine.

[njhussey]

Nice build Tom

[routercnc]

Much better now.

Looking at your control box picture in post#66 the stepper motor cables are very close to the toroid - seems to run OK without load and without spindle running but one to watch if it glitches ?

[Tom J]

Much better now.

Looking at your control box picture in post#66 the stepper motor cables are very close to the toroid - seems to run OK without load and without spindle running but one to watch if it glitches ?

Picture 66 shows different control box - 7A biger machine and was unfinished - cable runs on other side and all are screened and grounded to the plate. Inverter is outside with built in emf.

[Tom J]

Tom it looks like you could increase the acel settings. Have you thought about putting a W.C spindle on it?

Nice machine.

Waiting for 48V PSU and will try to bring voltage to 45V and tune again.
I had one 1.5 Kw fi 60mm, but was leaking so had to send it back.
2.2kW is way too big.
See on design:

[JAZZCNC]

Waiting for 48V PSU and will try to bring voltage to 45V and tune again.

Be careful Tom because these drives don't tolerate much over 52V Spike so if your Input voltage varies very easy to peak above 50V.
Certainly don't go above 45V.

[Tom J]

Be careful Tom because these drives don't tolerate much over 52V Spike so if your Input voltage varies very easy to peak above 50V.
Certainly don't go above 45V.

Great stuff.
Just tested:
http://www.ebay.co.uk/itm/AC-DC-5-12...-/351624473683

I can adjust voltage from 32-57V DC and there is no spike on start up.
still have to find sweet spot below 50V taking emf into account.

[JAZZCNC]

Ok thought you was talking toroidal transformer. Personaly Not fan of these type of supplys because they can Clamp and lock up if the back Emf gets high. That said If your not flying about with fast direction changes and on light-ish machine probably not have any issues.?

[Tom J]

I only temporarily hook up toroidal trafo , this gave me only 40V (2x30V AC).
My control box is very small same like machine so end up with Chinese power supply - not so big fun of them, but hey ho.

Jazz what do you mean by clamp and lock up when EMF gets high?

[JAZZCNC]

Jazz what do you mean by clamp and lock up when EMF gets high?

The PSU can have protection circuitry which trips the PSU into fault mode if voltage or current rise above certain threshold. So if the back Emf from motors is high. ie: Like when changing direction at high speeds with heavy gantry the current can spike above this amount and cause trip.

The caps in toroidal supply absorb this back EMF so it's not problem.