John, you can look here for stepper motors and drivers http://www.driver-motor.com . They have good prices and fast shipping through DHL.

Hi
I have four 34HS9801-G5 MotionKing stepper motors
I have been trying to work out why my mech mate does not move the correct distance(accordind to theory). So I put a signal generator onto the step input and measured the time for a number of revolutions using the MotionKing driver. (tried DC supply and AC supply to MotionKing Driver, no difference)
I always needed 17/16 more pulses than theory said I needed.
I changed to a gecko drive and repeated the test with a bench power supply and wiring direct to the motor. Still needed 17/16 times more pulses than the expected 200 steps at the motor X 5 for the gear ratio.

My conclusion is that the gearbox is not exactly a 5:1 ratio.
I have not seen any other problems with the motor or drive.
Cheers
David

David, interesting discovery with that Motionking gearbox...have you asked MK to confirm the ratio?

Hi Gerald

There answer was:
We are having Tomb-Sweeping Day holidays from Apr-03 ~ Apr-05(Sun ~ Tue). Your email will be read & replied after holidays.
So maybe next week :)

I bet 99% of you will be puzzles by this Tomb sweeping thingy:confused:

They meant they are observing the Qing Ming Festival, it is the time of the year on Chinese lunar calendar dedicated for visiting ancestral cemetery. Cleaning & sweeping the tombs is standard operating procedure :)

Its like a big family picnic, where all the family members gather at the cemetery, after the prayer, we will have a big feast & free flowing of choice beverage.

I'll be doing my part tomorrow. :D

Answer from Motion King
Dear David Bryant,

It's 1/5.32.



Thanks & Best Regards!

Media Lee (Mr)
==============================

MotionKing Motor Industry Co.,Ltd.
http://www.MotionKing.com
[email protected]
Tel: 0086-519 8988 6261
Fax: 0086-519 8515 1172
===============================
2011-04-07

So Off to get the calculator out to see if I get it right..........

There maywill be more decimals after the 5.32****

We must think alike 25:133
:) took me a while.

Got the new value installed 87.402 pulses per mm.

As close as I can measure with a rule :) so onto more testing and setups.

Thanks for the input.
David

Do you have a specsheet or dimensions on that motor/gearbox? I am curious whether the reduction is by a single pair of gears (25:133) with output shaft well offset, or whether there is an intermediate shaft with 2 pairs of gears, with less of an offset.

A single pair would theoretically be the better option with less chance for backlash and less friction. (OM motors have intermediate shaft and 2 gear pairs).

Hi Gerald
The output shaft is so close to the edge I assume that there will be an intermediate shaft.
Just been fighting with image resolutions and adding photoes.
I think it has been attached...
Ps the adjustable z Limit proxy and target can be seen in the photoes.
Cheers
David

AH HA The second photo was vertical so was tripping on max size..

I like your placement of the Z limit proxy. I bet there is about .020 clearance between that adjustable flag and the spider. Nice work.

Sean

Hello Sir,

Thank you for your inquiry about our cnc parts, we'd like to make the best offer as below:

1, 86HS9801 stepper motor: USD48.00/pc. x 4 pcs = USD192.00
2, DM856 stepper driver: USD65.00/pc. x 4 pcs = USD260.00 (DM556 stepper driver: USD58.00/pc. x 4 pcs = USD232.00)
3, Timing pulley 15XL: USD9.00/pc. x 4 pcs = USD36.00
4, Timing pulley 72XL: USD26.00/pc. x 4 pcs = USD104.00
5, Timing belt 300-XL-10 (length-XL-width): USD4.00/pc. 4 pcs = USD16.00
6, HF spindle DTS-23: USD238.00/pc x 1 pc = USD238.00 (HF spindle DTS-27: USD800.00/pc x 1 pc = USD800.00)
7, ER20 collect chuck: USD6.00/pc x 3 pcs (each size is ok) = USD18.00

The leadtime for the production is about 3 weeks.

As for the stepper diver, if you would work it with 86HS9801 stepper motor in high speed, it's recommended to use DM856 as the voltage is higher so the motor can run stable at high speed.

Also for the HF spindle, it's depends on how much power you need, because DTS-23 is 2.2KW and DTS-27 is 4.5KW, if 2.2KW is enough for you, DTS-23 is ok because it's the most pupular sale spindles.

To ship above quantity by DHL to you, the shipping is about USD191.00, with driver DM856 and spindle DTS-23 selected.

Also we have seashipment to Holland every month, if USD191.00 is too high, we can ship the goods by sea to our Holland office first, and then our Holland office send those goods to you by truck, guess that's much cheaper.

This above is offer sent to me yesterday from http://www.driver-motor.com

34HS9801 = 86HS9801 they are the same
www.driver-motor.com/ProductContent.aspx?ID=47

Hi Lubo
I have four 34HS9801-G5 MotionKing stepper motors as shown in photos above. These have built in gearboxes 5.32 to 1 ratio as discussed above.
I have had no failures so still have not pulled one apart.
Little backlash.
ran 5 hours yesterday cutting 10mm thick Aluminium. :)

Cosider a full set of collets. (My local shop charges about $26USD each)
Consider a spanner to suit collet
Cheers
David