Motors and gearboxes

OK, so I found some motors and gearboxes on ebay. I would have already ordered motors from Motion Dynamics but the fees and shipping just make them too expensive so I've been looking at ebay and uk suppliers.

I have some questions.
What is the difference in the MCP 4 and MCP 2 gearboxes? They are both 25:1.
Is it better to have an aluminium housing on the gearbox?

Is this motor any good for a sim?
http://www.ebay.co.uk/itm/DC-Brushl...ial_Automation_Control_ET&hash=item588cb639dd

How much torque does a motor need before it is attached to a worm drive gearbox?
I know this is very subjective to what I build but I'd like some versatile motors to start off with and I can't afford to get it wrong and have to change them as I intend to buy at least 3 motors and gearboxes straight off and possibly add more afterwards.

Hi Barry. I've attached the specification details on the MCP2 and MCP4 gearboxes, I hope that helps.

If you find suitable motors I have a couple of MCP4 50:1 ratio gearboxes for sale, take a look at Marketspace. These are single output shaft (the drive shaft is on one side of the gearbox). I need to check but I'm pretty sure that I also have couple of dual shaft 50:1 units which have the drive shaft available on both sides.

These 50:1 ratio gearboxes are now extremely difficult to source. Over the 25:1 ratio gearbox the output speed is halved but the torque is doubled.

Thanks for that.
Finding motors seems to be the problem at the minute.
So as far as I can see from the specs, the MCP2 has 2 shafts, the MCP4 has one, and they're a slightly different size and shape. But as far as I can see that's about it. Even fitment seems to be the same.

I'm trying to work out how much torque I need from a motor. I would assume I need 20Nm+ for a sim?
How many Nm do I need from a motor on a 25:1 gearbox? Is it 0.8 or more Nm?

If I take a 4000rpm motor link the one in the link above and attach a 50:1 gearbox I would only have 80rpm. Is this correct and is it enough for a sim? And the torque would be (in this case) 16Nm. Are my calculations correct?

Is this motor any good for what I'm looking for?

http://www.parvalux.com/dload/ebrochures/pm-catalogue-2009/files/assets/downloads/page0032.pdf

Or is that a little too heavy duty for JRKs?

I can get a couple of these for around £40 each.

Hi @Barry

Any good? https://trolleys4golf.com/id34.htm

regards Terry

Hi Barry. The MCP4 is available in both single and double shaft versions. The output torque of the ZYT90 motors that I had was 0.8Nm so, taking no account of mechanical losses, the torque output would be 20Nm for a 25:1 ratio gearbox and 40Nm for a 50:1 ratio gearbox. The ZYT90 motors were rated at 4700rpm but usually these run around 5000rpm, giving 100rpm output from a 50:1 ratio gearbox and 200rpm from a 25:1 ratio gearbox.

There are users on here who have built successful motion simulators using both so I would assume that it's up to you, whether you prefer a faster rpm output or greater torque output.

How much motor torque you need will of course depend on what type of motion simulator you're building and how much weight you need to move. Hopefully Dave (@bsft) may come in here as he has a wide experience and may be able to help you better, perhaps once he knows what you're planning.

Initially I want to build a 2Dof driving sim with Traction loss and as far as weight goes I think the sort of basis to work from would be 100Kgs driver + seat and frame. I would like to improve the system in the future if needed but a good starting point would be to get good motors from the beginning.

@telfel Those motors look good but I can't see any specs so I might need to call and ask about them.

Not sure, whats the rated current? It shows continuous current, so maybe thats the rated current.
From what I can see the 2000 rpm motor is about the limit as starting current is about 3 times that. And as we run stall, which is near starting current, thats the limit.
@Roadster2 has motors and gearboxes that will do the job great.
Usually, and I know as I have JRKS, a motor of 200 watts for big worm gear and 250 watts for winches is about the limit of the JRK. Because the motors can get over driven by 2.5 to 3 times rated current on spikes.
Now the JRK will run 49 amps continuous for about 5-6 seconds before shutting down, but really, they shouldnt be run that hard. Normally most of us get about 30-38 amps continuous and some 45 amp split second spikes of current. The continuous current is fine as long as JRK is heat sink and fan cooled.
@Barry , as you are planning a 2DOF with drift frame, as the weight of you is over the pivot , as long as you take into account how big a frame you plan to build. If its full frame, 50:1 boxes at shoulders, seat mover 25:1 boxes will do it.
Frame design is crucial to motor and gearbox selection. Did you have a design in mind?
Cheers, David.

Thanks for that.
Sorry for the late reply. It's been a busy weekend. I need to really sit down and get a design drawn up. I'll try to find something this afternoon that I'll be basing it on. Everyone here has made great designs so there's plenty of inspiration.

Here's a quick question.
How hard is it to run 24V motors? I've seen a few 24v motors which have all the right specs but I've kind of blanked them as I assumed I need 12V motors. Sorry, that's a bit of a noob question but I thought I better clear it up.

If using jrk's, you need 12volt.
Dont want to use 24volt motors to run at 12 it will be to slow and no torque.

That's what I thought. I'll stick to the 12V plan.

Tharts right 12v motors with 12v controllers.
Stop Listening to racingmat and his "brilliant" idea of using 24v on 12v. Its half the speed, half the power, and twice the headache.