Denford Microrouter V4

[andy_con]

just properly ran some code on the machine, I had ot stop after 20 mins as the motors burnt my hand to touch.

all 3 seems to be getting the same temp.

how do I go about trying to resolve this?

[lucan07]

If you are still running at 36v 2.8a I would try dropping it to 1.5a to see if they still heat up if they can't handle 1.5a maybe try some different drivers. Was the machine running when you purchased it or did you never see it running?

[m_c]

I just googled the stepper motor model number, and it threw up a few different datasheets/catalogues.

The catalogue for MAE stepper motors is http://www.probyte.fi/pdf/HY200-3424-0170.pdf
Which confirms the 3A/75V ratings.
However another datasheet put that exact same model at only 2.1A per phase.

I can't find any definitive figures for maximum temperature, but up to 80degC seems to be a common recommendation. If you are running the motors below their ratings, I wouldn't worry too much about it.
If you're not happy with them running that hot, try what Lucan suggests, and drop the current setting further.

[andy_con]

Will drop the current one step

First bit if work completed

[andy_con]

Ready for painting

[magicniner]

Will drop the current one step

First bit if work completed

Andy,
That all looks great, but have you considered adding a V-carve type path about 4mm deep with a V-bit cutter for the outlines?
That would give you near pin-sharp corner definition on characters and graphics where they merge and the cutter diameter cannot manage sharp corners,
Regards,
Nick

[andy_con]

the machine only came with a single 6mm collet so im limited to 6mm shank tools at the moment. ive ordered some more collets from the us which im waiting to arrive, once I get them I can start using more tools.

that engraving one done with a v-bit router tool, but only 0.3mm deep. were I to have the right collet I would have done it 1mm deep with a 1mm end mill

im pretty new to wood, so still learning what gives the best results. ive since painted that engraving so its looks much better now

Andy,
That all looks great, but have you considered adding a V-carve type path about 4mm deep with a V-bit cutter for the outlines?
That would give you near pin-sharp corner definition on characters and graphics where they merge and the cutter diameter cannot manage sharp corners,
Regards,
Nick

[magicniner]

V-Carve paths are 3D and lift the V Bit at the corners to give straight lines/accurate curves right up to any sharp corners,
Regards,
Nick

[dodgygeeza]

if the motor is 8 wire, then 3A is the unipolar current and 2.1 is in series and it will be 4.2 in parallel. this is typical for 8 wire motors.