Giant 20' x 3' x 2' router build

**charlieuk** · 11-06-2014

things are starting to move again i have just started to get some of the electrics together and things like the spindle is on order. I am all so in the process of designing a sprung motor mount for the rack and pinion and will be looking for some one to be able to machine it if there are any willing people?

**charlieuk** · 23-06-2014

i just got my 2.2kw spindle and mount through in the post and now have the task of fixing it to my 80x80 ali extrusion and was just wondering hows best to do it? The mounting flanges are a lot wider than the extrusion so im wondering if its best to tap the back of the mount and drill some holes all the way through the extrusion so i can bolt it from the back?

**JAZZCNC** · 23-06-2014

I would go with a Piece of plate same width as spindle mount fastened to extrusion with some nice strong bolts then fasten mount to that. This will make setup and tramming the spindle easier and backup the mount a Little.!

**charlieuk** · 23-06-2014

i did a little mock up in wood. In a aid to try and neaten things up i have taped some holes on the back of the mount and bolted it to the plate the heads of these bolts then actually locate into the slots of the aluminium profile then there are four bolts which actually bolt it to the aluminium extrusion using slide nuts. At the moment they are just m6 but i will change those to m8 when i get some larger slide nuts or tap some out.

Ps im not sure why all my portrait pictures get rotated to landscape?

**irving2008** · 31-10-2014

The solution to the capacitance issue, if that's what it is, is to buffer the switches locally. It's not clear to me where the switches are located but a simple transistor or IC buffer would fix it at very low cost and could handle multiple switches if they are close together.

**Jonathan** · 31-10-2014

Originally Posted by irving2008

The solution to the capacitance issue, if that's what it is, is to buffer the switches locally. It's not clear to me where the switches are located but a simple transistor or IC buffer would fix it at very low cost and could handle multiple switches if they are close together.

That's far too logical a suggestion for this discussion ;)

If charlie's keen he could put differential signalling ICs (e.g. MAX488) on both ends and may alleviate problems later on. They're low cost and easy to implement since the circuit's in the datasheet...probably excessive though so personally I'd try a transistor first as it'd take 2 mins to test.

**charlieuk** · 01-11-2014

The switches are all on the gantry on the moving side of each axis, just let me know what I need to do to try your idea and I will give it a shot if I can get the stuff as I don't really understand what you are saying at the moment.

**irving2008** · 01-11-2014

Ok, how many switches are there, what polarity (npn or pnp) and voltage? How are they currently wired?

**charlieuk** · 01-11-2014

There are 6 in total 3 home 3 limit all pnp nc each one has a common + and - up to a junction box on the gantry were they go off on there own each have there own separate input wire on the csmio . the main wire is a 12 core cy screened and earthed at the control box all running on 24v

many thanks

**Clive S** · 01-11-2014

Just for completeness (I am not familiar with the csmio) as this thread is long is the 24V ps -ve connected to the -ve on the controller board.

I would be very surprised if it turns out to be the switches although I favour npn type.
As has been said I don't think the cable length should be an issue.

Have you tried a small capacitor at the machine end of the ps supply cable across the +ve and -ve.