| Author |
Message |
Andrew Cowan (Cowana)
Member
Username: Cowana
Post Number: 14
Registered: 5-2008
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| Posted on Thursday, February 12, 2009 - 9:12 pm: |
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Dear Technical
I want to add a robotic arm to my robot - something like www.superdroidrobots.com/HD2_Arm.htm.
Their arm seems to be just over one meter long. I have asked them what motors they use, but they don't reply. They state their arm can lift 9kg - thus the torque at the base would be around 900kg/cm.
I want to create a similar arm. I do not mind if it doesn't have as much torque as theirs does, but 500kg/cm at the base would be great.
Do you have any recomendation on what motors or servos would be good for this application? From watching their videos, I calculate their motors to rotate at around 1.5rpm.
Many thanks for your help,
Andrew Cowan |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 978
Registered: 10-2004
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| Posted on Monday, February 16, 2009 - 4:10 pm: |
|
Andrew,
We do not have any servos of that size, not even close to it.
You could try a geared motor like the 1450-322 with a further 10:1 reduction. In theory, the 1450-056 with a 3:1 reduction should also work. This is quite a load on the gearboxes but worth a try.
Regards
Paul |
Andrew Cowan (Cowana)
Member
Username: Cowana
Post Number: 15
Registered: 5-2008
|
| Posted on Wednesday, February 18, 2009 - 9:53 am: |
|
1450-056 does look pretty good.
Is there a flat on the shaft? Mounting the shaft to the arm sounds like a tricky problem.
Andrew |
Admin (Admin)
Board Administrator
Username: Admin
Post Number: 983
Registered: 10-2004
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| Posted on Monday, February 23, 2009 - 7:19 pm: |
|
Andrew,
Yes there is a flat on the shaft. It's not just a question of mounting the shaft to the arm, it's the incorporating the extra 3:1 reduction in between. |
Andrew Cowan (Cowana)
Member
Username: Cowana
Post Number: 16
Registered: 5-2008
|
| Posted on Wednesday, February 25, 2009 - 7:11 pm: |
|
I don't think I'd bother with the extra 3:1 reduction - 463200g/cm sounds good enough. It's either that or using servos (with about 22000g/cm for the same price). Maybe even using two at the base?
Andrew |
