Re: [CAD_CAM_EDM_DRO] Gecko 2xx "Nema 42 modification"???

Peter,

I noticed that you're driving the knee for your Z instead of
the quill. Does this work pretty well? Does the Z have a ballscrew
or the original ACME? Are you doing anything to try to counterbalance
the weight of the knee?

Sorry for all the questions.

Thanks,
Drew

Peter wrote:

>
> Hey Paul,
>
> Hanging out in this chat group is so much more fun than working... If
> only it paid the bills! Thank goodness I have all this stuff written in
> my notebook... Here goes,
>
> I selected a toroidal transformer rated at 45V, 14A (625VA). Bridge
> rectified, with a 12,000uF Cap, this yields ~65VDC. The make of the
> transformer is Plitron - made here in Toronto, but I purchased it thru a
> local distributor.
>
> The connectors are AMP (now Tyco Electronics) Circular Plastic
> Connectors (CPC's) Series 1 purchased online from Digikey. The CPC's
> are cheap with each piece a couple of $. The crimp tool is VERY
> expensive but is needed to do a good job of the crimp terminations.
> (Solder tab version pins may be better for small qty's)
>
> The motors are Sanyo Denki Model 103H89222-5241 (Mendonet P/N
> 426-1870-SB) 1,869oz-in, 6 Amp, 2.70 Volts 0.45 Ohms, 5.40 Mh,
> 6.43" Length Motor website http://www.mendonet.com/steppers/nema42.htm
> shows torque/speed curve. I purchased the Geckos and the motors all at
> the same time, from Mendonet.
>
> I use shielded cables everywhere, with shield grounding done only at the
> Gecko box end. All cables are 18G multistrand with aluminum foil
> shielding and cost approx. $1 per meter. It's not super flexible cable
> or anything exotic. Before I learned about the Gecko step rate
> multiplier board problem I had assumed motor noise was getting into my
> step signals so I even replaced the cables inside the box (after the
> photo was taken) with sheilded cable but I don't think that was
> necessary as the problem remained.
>
> Now, back to work...
>
> Cheers, Peter
>

--
Drew Rogge
drew@...