More ebay motors

[RuthlessRob]

Hello out there,

Has anyone had any dealings with these motors that are sold on ebay?

 

http://www.ebay.co.uk/itm/12V-1000RPM-Torque-Gear-Box-Motor-New-/330760836631?pt=UK_BOI_Industrial_Automation_Control_ET&hash=item4d02e1d617

 

I realise that they are probably cheap and cheerful but come in different sizes and various gear reductions.

 

This is only my second post on here and I know that some subjects are hard to find, so if it has already been dealt with I apologise for time wasting.

 

 

Rob.

 

[black5f]

No experience but look like nice little motor gearboxes for projects.

 

Found the motor specs here..

 

http://www.standardmotor.net/sc_webcat/ecat/product_browse_list.php?lang=1&cat=204

 

T

[DCB]

It looks like a quite ordinary computer motor as found in all sorts of CD drives etc and which I have used quite successfully with Romford 60 to 1 gears in small 00 locos like the Dapol Pug and Airfix 14XX, but coupled to an epicyclic reduction of around 10:1, the problem is that 3mm dia D shaped output shaft which is going to be very difficult to attach a worm or any other output gear.

 

Even with the gearbox removed the armature shaft may not be long enough for a worm, of course the motor shaft may extend into the output shaft but I would rather use a motor which I  know I can attach an output gear to.

[Andy Reichert]

I think you'll find that the reduction gearing is too great to make the motor practical for driving a locomotive or powered coach. At 12 volts with even a fast 12:1 worm drive to an axle, you 'd be lucky to go much over a scale 10-15 mph flat out.

 

( I'm assuming motor itself goes at around 10,000 rpm at 12 v)

Andy

[Tiptonian]

Although no reduction ratio is stated, the speed given is 1,000 rpm, which sounds like the speed after gear reduction. If this is the case, then a 1:1 bevel drive onto the drive axle should produce a useable, if slightly fast, mechanism. The following could be used:-

 

http://www.technobotsonline.com/mini-plastic-bevel-gear-33527.html

 

They would, of course, need to be bored out. This particular set, being low cost and fine toothed, would probably only be suitable for light duties, but other sets of bevel gears can be obtained.

 

If fitting to a small locomotive, the main problem with using this type of drive is that the motor, gearbox, and bevel drive are all in line, and the length builds up.

 

Edit:- Looking at the advert for the motor, I prefer the one advertised at the bottom:-

 

http://www.ebay.co.uk/itm/12V-1200-RPM-Torque-Gear-Box-Motor-New/360519149457?_trksid=p2047675.c100009.m1982&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D28111%26meid%3D7d3a7f0777dd434ea86d409d36ce0cb1%26pid%3D100009%26prg%3D11472%26rk%3D1%26rkt%3D10%26sd%3D330760836631

 

It has an open gearbox which can be lubricated, and if the motor burns out, the gearbox could be detached and fitted to a new motor. A bevel drive with 2:1 ratio is probably better for the 1,200rpm output.

[RuthlessRob]

I think you'll find that the reduction gearing is too great to make the motor practical for driving a locomotive or powered coach. At 12 volts with even a fast 12:1 worm drive to an axle, you 'd be lucky to go much over a scale 10-15 mph flat out.

 

( I'm assuming motor itself goes at around 10,000 rpm at 12 v)

Andy

I was just using this motor as an example, there are different sizes and gear ratios on offer.

[RuthlessRob]

Although no reduction ratio is stated, the speed given is 1,000 rpm, which sounds like the speed after gear reduction. If this is the case, then a 1:1 bevel drive onto the drive axle should produce a useable, if slightly fast, mechanism. The following could be used:-

 

http://www.technobotsonline.com/mini-plastic-bevel-gear-33527.html

 

They would, of course, need to be bored out. This particular set, being low cost and fine toothed, would probably only be suitable for light duties, but other sets of bevel gears can be obtained.

 

If fitting to a small locomotive, the main problem with using this type of drive is that the motor, gearbox, and bevel drive are all in line, and the length builds up.

 

Edit:- Looking at the advert for the motor, I prefer the one advertised at the bottom:-

 

http://www.ebay.co.uk/itm/12V-1200-RPM-Torque-Gear-Box-Motor-New/360519149457?_trksid=p2047675.c100009.m1982&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D28111%26meid%3D7d3a7f0777dd434ea86d409d36ce0cb1%26pid%3D100009%26prg%3D11472%26rk%3D1%26rkt%3D10%26sd%3D330760836631

 

It has an open gearbox which can be lubricated, and if the motor burns out, the gearbox could be detached and fitted to a new motor. A bevel drive with 2:1 ratio is probably better for the 1,200rpm output.

Yes, I 've seen that one aswell.

[Andy Reichert]

I was just using this motor as an example, there are different sizes and gear ratios on offer.

 

Yes, but I thought that was the fastest of those listed that included a reduction box. A pre-worm reduction somewhere around 1:2-3 usually gives a realistic speed range. And that is easily done with a belt and two pulleys, or two spur gears.

 

Andy

[Horsetan]

Although no reduction ratio is stated, the speed given is 1,000 rpm, which sounds like the speed after gear reduction. If this is the case, then a 1:1 bevel drive onto the drive axle should produce a useable, if slightly fast, mechanism. The following could be used:-

 

http://www.technobotsonline.com/mini-plastic-bevel-gear-33527.html

 

They would, of course, need to be bored out. This particular set, being low cost and fine toothed, would probably only be suitable for light duties, but other sets of bevel gears can be obtained....

Alternatively, these look useful...