Denford Triac VMC with ATC Conversion / Fix

[andy_con]

Direct motor replacement, 4400 rpm due to slight change in gearing.

Im in West London - UB108TE, feel free to pop around, Im home Saturday if you want to see my mess.

Ill take some pics anyways to share.

Not knocking ya build or anything but triac comes with a 4000rpm motor so that's not really an upgrade.

I want to min of 10000rpm

What electronics do you have? I'm assuming your running mach?

I have full drawings to upgrade the atc to 10 tools just never got round to making it. It's just a new disk/bit that holds the tools and stepper motor to spin the disk

[Chaz]

Not knocking ya build or anything but triac comes with a 4000rpm motor so that's not really an upgrade.

I want to min of 10000rpm

What electronics do you have? I'm assuming your running mach?

I have full drawings to upgrade the atc to 10 tools just never got round to making it. It's just a new disk/bit that holds the tools and stepper motor to spin the disk

It wasnt meant as an upgrade. It was meant to get me up and running again. The DC motor was failing and I had to make do with something as I am using the Triac to make parts for my new machine.

10K is possible, of course, but its a fairly big undertaken and not a 'hot swap' like what I did.

I am running with CS Labs - Mach 3 - Servos all round for all axis.

[andy_con]

ah fair enough, ive had issues with my motor and still do to be fair.

I put mine in for a £500 repair which hasn't really done a lot, so wondering if its the sprint drive card.

indeed 10k is possible its just finding a suitable replacement atc motor. id settle for 18k or 24k providing its an atc model.

mines a standard triac, so normal stepper motors, ive got PMDX126 in there, with ESS. I out in spindle feed back and have touch probe and z height setter wired in.

but my goal is a new atc spindle and then ill finish the electronics with new stepper drivers and out 10 station atc in

[Chaz]

ah fair enough, ive had issues with my motor and still do to be fair.

I put mine in for a £500 repair which hasn't really done a lot, so wondering if its the sprint drive card.

indeed 10k is possible its just finding a suitable replacement atc motor. id settle for 18k or 24k providing its an atc model.

mines a standard triac, so normal stepper motors, ive got PMDX126 in there, with ESS. I out in spindle feed back and have touch probe and z height setter wired in.

but my goal is a new atc spindle and then ill finish the electronics with new stepper drivers and out 10 station atc in

Im selling my Sprint 1220i controller if you need a replacement.

[andy_con]

Im selling my Sprint 1220i controller if you need a replacement.

how much?

I really want a new spindle set

[Chaz]

how much?

I really want a new spindle set

They are around £270ish new, Ill take £100.

[m_c]

Space is certainly a challenge with triac spindles.

Andy, what is wrong with your spindle motor/drive?
Mine started hesitating and making what's probably best described as a rumbling noise, followed by tripping the RCD at higher speeds. I took the brushes out, and there's signs of arcing on one of them, and another was sticking in the holder, but giving them a clean never made any difference.
The armature isn't that clean looking, however I won't be able to get the motor apart without using heat to get the pulley of, and I suspect the real problem lies with the drive. For it to trip the RCD, there's either got to be an excess build up of carbon inside to give continuity between the brushes and the case, or the SCRs on the drive are starting to breakdown and shorting to GND.
From past experience with my old lathe, the rumbling noise is consistent with a faulty drive.

If you want a new replacement DC drive, KB Electronics drives aren't that expensive. For basic speed control, a KBIC would work, or if you want to keep the tacho feedback, a KBMM would be needed. You'd also need to add the extra heatsink for either option to get the rated power capacity.
Axis Controls are one of the UK distributors, who I'd happily recommend as they've always been helpful when I've used them - http://www.axiscontrols.co.uk/shop/kb-electronics-dc

I think I'll go and start a new thread about my replacement plans, as I'm umming and arring over the design.