View Full Version : Pacer compact rebuild

27-12-2012, 12:04 PM
I bought an old Pacer compact 800+ cnc router on ebay some time ago, only to discover that it is made of MDF.

I am thinking of putting it back into commission, but would like some advice as to wether it is worth it.

The gantry sides seem to be MDF about 34mm thick with an inset area housing a metal plate which holds the ballscrew(20mm) and the two unsupported rails(30mm).the distance between these rails is 200mm and the gantry side spacing is 1050mm. The gantry sides are joined by
a 20mm thick top rail, and another that runs across under the machine bed.

The Z carriage assembly is aluminium and looks to be quite substantial.

The other axis seams to be quite well supported on linear rails with a 20mm ballscrew down the centre.

I had intended to make sure that every thing was tightly fixed and simply replace the electronics, but after reading comments on this site
about unsupported rails and flimsy gantries would like further advice.

The materials I cut are mainly MDF, plywood, PCB material and some plastics, so no metals or anything too hard.

I make dollshouses and miniatures on my other router (converted pcb machine, very heavy and robust), but the 800x800 bed on the pacer
would be so much better for some things than my existing 540x450.

Any comments would be much appreciated, even if a bit derogatory!!!

Thankyou, G.

24-01-2013, 08:17 PM
Well, its some time now since I posted, but have heard nothing back about my Pacer Compact 800+, so I assume that nobody on the site has any experience of the beast.

I have checked on what steppers are fitted (I can only get at the Y(gantry)axis at present and it fitted with a motor motor marked as SIGMA model no H33NRFC-LNN-N8-00 class B. It is a four wire motor motor.

Does anybody know anything about these motors(I assume X & Y are similar), current/voltage requirements etc. I intend to use this machine only for cutting MDF and thin ply (1.6mm) for the dollhouses that I make.

Any info would be much appreciated, apart from any suggestion to use the machine as a mooring weight etc. G.

John S
24-01-2013, 11:25 PM
They are type 34 motors, voltage doesn't matter as the driver takes care of this but amps is a bit unknown.
542's should drive these but I'd favour the 872's as being well within spec

24-01-2013, 11:40 PM
Thanks for the info John, I have been offered a three axis driver board with a controller and integral power supply.I understand it is rated at 48v and 3amps.

Do you think this would be sufficient? I do not intend to use mac to run this machine, but a dedicated PC via the serial port. G.

Do you know where I can find a spec. for these motors as a google search did not seem to find one. Thx, G.

John S
24-01-2013, 11:50 PM
What driver board?
I am very suspicious of combined boards and 3 amps sounds low for a type 34.
I did a quick search but couldn't find a spec

25-01-2013, 12:23 AM
John, the driver board is a separate board. These boards are from a pre usb Boxford machine. I thought that the current rating was a bit low, just looking at the stepper motor, but hoped it might be ok. Thx. G.

John S
25-01-2013, 12:27 AM
A lot of this early Boxford, Denford stuff was only half stepping and to be honest, crap.
Like most electronics 10 years is a lifetime.
If you want to use this pacer in anger, shell out and get some decent drivers, it's well worth it and they will be good for another 10 or so years.

25-01-2013, 12:33 AM
Thanks John, I thought you might say something like that!!! G.