| Author |
Message |
Mary Bardwell
Unregistered guest
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| Posted on Friday, November 18, 2005 - 4:46 pm: |
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HI Im trying to make the two arms on a cut out of a woman body-builder move up and down. Can you recomend a motor than can be attached to mains scorce of power and a mechanism to make the arms move? |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 91
Registered: 10-2004
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| Posted on Sunday, November 20, 2005 - 8:11 pm: |
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Mary,
We are unable to tell you exactly what you would need as that would involve an element of design work for which we would need to make a charge.
However, it is relatively easy for you to work out. You need to know the weight of the arms and what speed you want them to move at. You will also need a reciprocating mechanism to convert the geared motor output to the arm movement (like a steam driven locamotive engine). All of our geared motors have their speeds quoted for the various reduction ratios. If you want the arm to raise and lower say every 3 seconds, you will need a motor with an output speed of 20 rpm. Without knowing the weight of the arm I will suggest our most powerful range of geared motors which is the 919D and a look at the table for it shows the 810:1 (1450-055) gives 20 rpm at 12V. The torque for it is 125kg/cm so assuming an arm length of 75cm, the arm could weigh a couple of kg without too much problem.
The motor runs at 12V dc so you will need a power supply to run it, say one at 12V @ 3A minimum should be fine / motor. We have nothing that small although our 13.8V @ 20A (1090-016) for approximately £33 will be fine with plenty of spare capacity to drive 6 or 7 motors at full load.
Hope that is of some use. |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 205
Registered: 10-2004
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| Posted on Monday, June 12, 2006 - 9:36 pm: |
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Stephen,
Do you intend to still drive the motorcycle wheel by a 110mm roller or directly at the wheel axle?
If you still intend to use a 110mm diameter roller driven by one of our geared motors, then the 919D 148:1 at approximately 5V should be fine if the rolling resistance is as low as you suggest.
If you wish to drive the axle directly, your 7.75 rpm does not match our motor range without some additional gearing (maybe use our aluminium timing belts and pulleys) or accept the nearest size we have which is the 919D 810:1 at 4.5V or the 3000:1 at 15V.
If we can help any further, we would be glad to help. |
Stephen Skinner
Unregistered guest
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| Posted on Monday, June 12, 2006 - 8:38 pm: |
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Dear Sir,
I have been looking at your 919D spur geared motors, perhaps you could give us some help?
We would like to turn a motorcycle wheel which has little rolling resistance and a diameter of 670mm approx. At the moment we are turning this with a powered roller of 110mm diameter. With those dimensions, the powered roller turns at 46 revs per minute and the wheel turns at 7.75 revs per minute, this gives us the performance we need. Is it possible to use the 919D or similar to replace our powered roller?Thank you very much. |
Stephen Skinner
Unregistered guest
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| Posted on Tuesday, June 13, 2006 - 8:49 am: |
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Thank you for a very prompt reply.
Further to my first question, I would still like to drive the wheel with a 110mm roller. Would we be able to attach something to the end of the gearbox shaft so that we could use your 919D 148:1? Also, do we need some sort of power control, we are intending to run 2 motors simultaneously but not on the same wheel. If we had a power controller, is it possible to vary the speed slightly? Thank you again for your help.
Steve Skinner. |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 206
Registered: 10-2004
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| Posted on Tuesday, June 13, 2006 - 7:37 pm: |
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Stephen,
No problem, happy to help. The 919D 148:1 will give approximately 44 rpm at 5V but operating the nominally 12V motors at an under voltage will mean less torque but it may still be enough for your application. You can use one of our variable voltage regulators such as the 1062-004 to vary the speed of the motor fed from a 13.8V power supply (such as our 1090-016) so you could run the motors from a mains supply if needed else a rechargeable battery is an alternative.
You can add timing pulleys to 'fine tune' the gear ratio. I would recommend the 919D 148:1 at 12V with a 16T timing pulley on the motor and a 35T timing pulley on the 110mm drum giving you 48 rpm. You could even use our variable volatge regulator to drop the speed down to 46 rpm if this level of accuracy is necessary.
Regards
Paul |
