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Unread 09-12-2017, 12:24 PM
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pic: What Could Carpedav Possibly B Working On?

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Unread 09-12-2017, 12:26 PM
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Re: pic: What Could Carpedav Possibly B Working On?

Is that drum being balanced through some means I'm not seeing? Or is there going to be a second one of those?

How is the tooth going to be held in?
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Unread 09-12-2017, 12:59 PM
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Re: pic: What Could Carpedav Possibly B Working On?

The new Avatar is a giveaway:
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Unread 09-12-2017, 01:38 PM
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Re: pic: What Could Carpedav Possibly B Working On?

+1 on balancing necessities, looks neat. I assume you're going to weld that bar in?
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Unread 09-12-2017, 03:30 PM
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Re: pic: What Could Carpedav Possibly B Working On?

Quote:
Originally Posted by asid61 View Post
+1 on balancing necessities, looks neat. I assume you're going to weld that bar in?
Still deciding between tooth on other side or balancing by removing material. The tooth is getting welded and bolted in.
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Unread 09-12-2017, 05:32 PM
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Re: pic: What Could Carpedav Possibly B Working On?

Looks like someone used the wrong sized keystock.
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Unread 09-13-2017, 06:11 AM
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Re: pic: What Could Carpedav Possibly B Working On?

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Originally Posted by InFlight View Post
Looks like someone used the wrong sized keystock.
Nope! Keyway was manual machined by me
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Unread 09-13-2017, 09:27 AM
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Re: pic: What Could Carpedav Possibly B Working On?

What weight class? There are a couple of issues I think you'll run into if your doing serious combat.
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Unread 09-13-2017, 11:42 AM
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Re: pic: What Could Carpedav Possibly B Working On?

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Originally Posted by mman1506 View Post
What weight class? There are a couple of issues I think you'll run into if your doing serious combat.
Featherweight.
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Unread 09-13-2017, 06:31 PM
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Re: pic: What Could Carpedav Possibly B Working On?

I suggest having an odd number of teeth greater than one. Odd number of spokes naturally balance better than even numbers. (check out wind turbines, car wheels, etc.)
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Unread 09-13-2017, 07:06 PM
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Re: pic: What Could Carpedav Possibly B Working On?

Quote:
Originally Posted by Deke View Post
I suggest having an odd number of teeth greater than one. Odd number of spokes naturally balance better than even numbers. (check out wind turbines, car wheels, etc.)
My fear with going from single tooth to three-tooth is that with the intended weapon rpm (10,000-11,000), the opposing robot would ride up the wedge just fine, but the teeth would "grind" down on the other robot instead of hooking and throwing/breaking. I could lessen the weapon rpm, but I'm wanting to go with maximum impact. Unless someone knows this wouldn't be an issue.
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Unread 09-13-2017, 07:21 PM
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Re: pic: What Could Carpedav Possibly B Working On?

Quote:
Originally Posted by carpedav000 View Post
My fear with going from single tooth to three-tooth is that with the intended weapon rpm (10,000-11,000), the opposing robot would ride up the wedge just fine, but the teeth would "grind" down on the other robot instead of hooking and throwing/breaking. I could lessen the weapon rpm, but I'm wanting to go with maximum impact. Unless someone knows this wouldn't be an issue.
Single tooth is the way to go if possible. There are no effective modern spinners with more than two teeth AFAIK.

I'd be concerned about the hardness of your tooth. Most combat robots use AR500 (pre-hardened) or hardened S7 teeth (54 HRC). Even my AR400 beetleweight single tooth disk was pretty much useless after a couple of matches. Also the way the tooth is inserted into the drum creates a large stress concentration. It's probably going to end up cracking at the inside corners.
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Unread 09-13-2017, 08:11 PM
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Re: pic: What Could Carpedav Possibly B Working On?

Quote:
Originally Posted by Deke View Post
I suggest having an odd number of teeth greater than one. Odd number of spokes naturally balance better than even numbers. (check out wind turbines, car wheels, etc.)
If you look closely, wind turbines, car wheels, and such tend to have prime numbers of spokes. This reduces the number of resonant frequencies to worry about providing damping. Likely not a significant effect for this application.

While I've never done any combat robotics, I do agree that rounding those corners (especially on the hub side) would distribute the stress and improve the longevity of this if (as I'm understanding) that key is intended to be hitting things with a significant delta-velocity. I would also consider compliant ways to keep/return the key in the keyway as an alternative to a hard keeper.

Edit: OBTW, I'm not sure if everyone sees this, but on my computer, the OP photo looks like this device is stuck to a wall over a doorway rather than resting on a kitchen counter; it's rotated 90 degrees counter-clockwise from the direction I now assume to be vertical. Perhaps this perspective will make my earlier post make more sense...
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Last edited by GeeTwo : 09-13-2017 at 08:15 PM.
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Unread 09-13-2017, 08:21 PM
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Re: pic: What Could Carpedav Possibly B Working On?

Quote:
Originally Posted by carpedav000 View Post
Featherweight.
Banana for scale?

What are the dimensions,weight and how are you planning on driving it? That axle hole looks pretty small for a featherweight drum...( not that I can really tell the size).
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Unread 09-13-2017, 09:13 PM
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Re: pic: What Could Carpedav Possibly B Working On?

Quote:
Originally Posted by mman1506 View Post
Single tooth is the way to go if possible. There are no effective modern spinners with more than two teeth AFAIK.

I'd be concerned about the hardness of your tooth. Most combat robots use AR500 (pre-hardened) or hardened S7 teeth (54 HRC). Even my AR400 beetleweight single tooth disk was pretty much useless after a couple of matches. Also the way the tooth is inserted into the drum creates a large stress concentration. It's probably going to end up cracking at the inside corners.
That's why the drum itself is softer than the tooth. I was worried about wear

Quote:
Originally Posted by GeeTwo View Post
If you look closely, wind turbines, car wheels, and such tend to have prime numbers of spokes. This reduces the number of resonant frequencies to worry about providing damping. Likely not a significant effect for this application.

While I've never done any combat robotics, I do agree that rounding those corners (especially on the hub side) would distribute the stress and improve the longevity of this if (as I'm understanding) that key is intended to be hitting things with a significant delta-velocity. I would also consider compliant ways to keep/return the key in the keyway as an alternative to a hard keeper.

Edit: OBTW, I'm not sure if everyone sees this, but on my computer, the OP photo looks like this device is stuck to a wall over a doorway rather than resting on a kitchen counter; it's rotated 90 degrees counter-clockwise from the direction I now assume to be vertical. Perhaps this perspective will make my earlier post make more sense...
Sorry Gus but I don't quite understand the question...

Quote:
Originally Posted by pilleya View Post
Banana for scale?

What are the dimensions,weight and how are you planning on driving it? That axle hole looks pretty small for a featherweight drum...( not that I can really tell the size).
3.25" dia. x 3.4" length, about 8lbs, propelled using 2 v-belts and a brushless motor. Hole is 5/8"
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