Thread: Motors for a large gantry

Hello Blueray

Keling has the same motor / driver for US$226.00, if you are buying a " set " he most likely will deal a little too.

Why can't you get your pulleys bored to suit a different pulley.

Would you like a photo of a NEMA 34 in a laser cut " thingy " that will give a reduction of 3:1 then 2:1 or any in between??

Ed

You can get your motors and the same Kelling driver from China direct.
http://www.ms-motor.com/HB1.htm
Their web page is out of date so just send them an email. Shi Ming is the contact.
You will probably need 5056 for the Nema 23 and 8078 for the Nema34. It will also mean two different power supplies.
The reduction pulley improves your resolution 4 times as well as providing more torque so look at what that does by going direct drive.

Originally Posted by appiwood

Would you like a photo of a NEMA 34 in a laser cut " thingy " that will give a reduction of 3:1 then 2:1 or any in between??

Ed,
I am really interested in 'thingy's'. What about posting it here?

Cheers,

Alan

Hubbard (ebay link above) can do $220 each kit of 201 and 1200oz-in out of ebay.

I emailed MS motor ages ago but I dont know all the specs they are asking for.

Originally Posted by appiwood

Would you like a photo of a NEMA 34 in a laser cut " thingy " that will give a reduction of 3:1 then 2:1 or any in between??

Ed

If its no trouble.

Pull the motor spec from your other sites and ask him to match it and supply a suitable driver. I think you will find about 50% cost compared to what you are quoting.
Just watch shipping cost with them.
They are the suppliers to the USA sites and I tracked them down from the labels on motors. Their english is not too good so be patient and ask questions a second time if not answered.
They only sell the Kelling style drivers which are a rebadged Chinese drivers so if you want Geckos then you may be better with Hubbard or Kelling.

Originally Posted by rodm

Pull the motor spec from your other sites and ask him to match it and supply a suitable driver. I think you will find about 50% cost compared to what you are quoting.
Just watch shipping cost with them.
They are the suppliers to the USA sites and I tracked them down from the labels on motors. Their english is not too good so be patient and ask questions a second time if not answered.
They only sell the Kelling style drivers which are a rebadged Chinese drivers so if you want Geckos then you may be better with Hubbard or Kelling.

Any problems with the chinese drivers?

I have been running them on my X3 mill and no problems yet. I run two 497 oz Nema 23's for X and Y and 5056 drivers and on Z I run a 600oz Nema34 and 8078 driver.
They are the Kelling Style and model numbers are exactly the same.
This is getting into the electronics side so take my comments with caution.

Hello Allan

You will need to think how this will work when finished, I started pulling my existing machine apart this afternoon for the re-build, the first photo is of a single stage reduction, you can see from the saw dust on the motor how much crap - sorry swarf, lodged onto it, I had a cover on the belt, the new build has the motor under the table, still with both sides driven though, one bearing block is missing in the other photos, along with the correct belts and pulleys, but you get the idea, the motor is fixed, adjustment for the motor / bearing belt is in the two bearings, the adjustment for the bearing / shaft is the WHOLE assembly, note the slots at rach end of the " thingy ".
All these parts were laser cut then powder coated, so machining should be at a min'. The steel frame is 100mm by 50mm by 4mm RHS, if it's ever stolen it will need a team of footballers to lift it!

I had one cut to suit a NEMA 23 motor and the laser cutter charged me $20.00 ( 5mm steel ) all this is 6mm.

Hopefully the machine will only be out of action for a week or 10 days, I'm only waiting for the belt for the Y axis.

Ed

Hi Ed,
That is one very neat and well thought out thingy.

Just waiting on prices but ms-motor have recomended

8078 driver
34H2120-60-4A


1160oz-in Nema 34



Mmmmmmm powdercoating, always the best finish.

Im looking at 125x75 4mm or 150x100 4mm RHS (Wanted 150x75 myself but apparently no one has it), should only be a few hundred kg's. I recon 6-8 guys would be able to steal it or if they are smart just start up the forklift and drive away with it.

Still up on the design,

* lightweight with no supports and rely on flat ground
* heavy with alot of support supports (would be costy and heavy)
* Just box it like the comercial cnc routers are made.

That reminds me. Does anyone know what is under the table of a commercial CNC router? It would be good to see a few pictures as I wouldnt mind building a similar table.

Attached a image of a cnc router I coppied off a design I saw on the net. Getting pretty good at basic designs using Sketchup. I consider this my lightweight version it was designed to be a plasma table but the basic concept is still there.


I will convert the bottom for a router top but I wanted to know if it would be fine as I know twisting would be a problem but I am not sure with the heavy stuff as I have seen the 5x3" 4mm steel and I cant think of it ever twisting.

Thought id choose a design and ask what I should change or if there is a better design I should be using.





The rack and pinion would run along the side so that dust ect would not be a problem, I would start with a MDF top and later on probbaly get a Aluminium T slot if they make them that big.

Hello Blueray

The design looks pretty good to me, I think " normally " the commercial machines use the space below the table as storage or part of the vac' system.

Since you are planning on racks, could you use part of the Mechmate design for the racks / pinions / hold downs, they are already designed and ready to go, you might need to make some changes to suit your rails ect, but the system Gerald has designed appears to work well, I haven't heard anyone saying the spring jumps off the rack.

It is impressive that the rack is held down by tape, again there hasn't been any reports of that failing either.

2 cents worth
Ed

For reference to anyone looking at Nema 34's

8078 driver,price is 96.00USD/PC
34H2120-60-4A with gear 3:1,price is 115USD/PC (72 without)


Gecko 201's were only a bit more expencive so I think I'll just go with them.

The motor price is with a 3:1 gear reduction and postage is $270USD must be through a courier.



I will have a look at the mechmate site it might be a more stable design for the base and looks good. I ment to look at it before but I was too lazy to register.

Hi Chris
Not as big a saving as I would have expected - about $47 on the motors and about $37 on the driver but you probably loose some of that on transport. MS always send express through EMS and it usually is delivered by Australia Post unless it is a heavy parcel.
Thanks for sharing the pricing it is good to keep up with latest costs.

Yes agree Gecko probably better option in this case.