There is no electrical harm in using larger wire, as long as you dont create a situation where a large wire feeds an overly small wire. A common term for this is "fuse".

Larger wires don't bend as well as small ones.

The Shopping continues
 

After removing the cubic foot or so of copper, + iron, I got an unused, air tight, transformer box at the scrapyard. (pictures to follow). I ordered the Gecko G540. Asked for a final official quote from MotionKing for the 8801's.

There is something i worry about: From Gecko:
"]If your motor is below 3.5A, you can use the above drives as well as the G250, G251 or G540 drives.

If you need an all in one solution then the G540 is the drive for you. It has a built in breakout board, short circuit protection, opto-isolation, parallel port connection and four axis operation via DB9 motor cable connectors.[/

[COLOR="Black"] If I read the Gecko correctly, current set resistors are used to make the Gecko suitable for amps below 3.5. For motor current above 3.5, (such as the MK 34HS 8801, what must be done to make everybody play nice together? I guess I should ask Gecko.

Roger, do you mean MotonKing 9801... I don't know the 8801

MK 34hs 8801
 

http://www.motionking.com/show_produ...12&fenlei_ID=2

We will see if the link works.
I believe the advantage is supposed to be that the lower inductance will get the motor down into g-540 range.

All advice is gratefully accepted.

Too big motor for Gecko
 

I found out the effect of too many amps for the Gecko. In my case if a 4 amp motor is used with a board with a 3.5 amp reccommendation, the torque is reduced, in this case 3.5amp/4 amp = 87.5%.

Mk 34hs 8801
 

I found this link Kobus. There is more to it than just the author, but I forget what. I think it is partly cost.

http://www.mechmate.com/forums/showt...5&postcount=15

New Home for Kitchen Table: 50 cents / lb
 

http://s226.photobucket.com/albums/d...ctricalBox.jpg

In inches, it is, 20 high, 16 wide, 10 deep, with removable panel, 17 x 13. It was 1/2 dollar per pound.

The Doghouse
 

I am trying mightily to get a photo in here. It is in the manage attachments slot, so far, so good...
Oh!! Happy Day!

Another Check Please
 

I have on-hand, quotes from Motion King for the 34HS9801, the 34HS8801, and have a request in for prices on the 34HS6803
Specs are as follows and all I think are half coil.
Motor length Current, (A) Phs Resistance Phs Inductance (ma) wt

6803 66 2.7a 1.2 ohm 3.5 mH 2.0 kg
8801 78 4.0a 0.7 ohm 3.0 mH 2.5 kg
9801 98 4.0a 0.98 ohm 4.1 mH 3.0 kg

Kobus has run the 9801 with success.
The 8801's have been kicked around in the forum but 1.) I don't find a record of anybody useing them, and 2.) MK says no availability for 3 weeks after payment.
So My question is:
For a belt reduction option, wouldn't the 6803's come closer to the G540 ideal?

Thanks,
roger

Roger, I think you want to underdrive a larger motor, rather than overdriving (or just driving) a smaller motor. Otherwise, you're giving up torque you could have had.

I'm wondering if belt drive reduction would take care of the torque issue. I think the lower induction, (relative to the 9801), maintains the torque out to higher rpms, so that's good for the belt drive, right? The little motors save a kg each for reduced momentum so that should be good, but probably not really significant.

Other than putting together a system that won't explode and burn to the ground, my other concern is that I have ordered the G540, and I have the power supply parts in hand, so I will need motors that fit within those constraints. From my point of blessed ignorance, I think any of these motors should work.

I would have more confidence if Motion King had a conventional shopping interface. I presume they will eventually produce an invoice I can paypal off of.

Thank you for your review, and as of now no motors have been purchase.
roger

34HS6803-G5 and G10
 

My mate has just got a quote back from Motion King about the 34HS6803 motors with a gearbox. They come in 5:1 or 10:1 reduction. The price we got is USD$115 for the G5 and USD$130 for the G10.

This would take care of the torque issue rather than putting a belt on it. At half the cost of the OM's they seem to be priced right.

Does anyone know about the quality of these motors with the gearbox?
Has anyone put these motors on a MM build?