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zsm150 07-02-2015 05:24
pic: One robots worth of gears
 

Mike Marandola 07-02-2015 05:25
Re: pic: One robots worth of gears
 
Looks great! How deep of a cut do you take out?

Bryce Paputa 07-02-2015 07:10
Re: pic: One robots worth of gears
 
One eighth of an inch on both sides, FEA said that we could go down to half of the thickness that we did and still be strong enough.

ice.berg 07-02-2015 09:17
Re: pic: One robots worth of gears
 
Curious as to why only one dog gear has been machined? Quality issues?

Bryce Paputa 07-02-2015 09:22
Re: pic: One robots worth of gears
 
Quote:
Originally Posted by ice.berg (Post 1439635)
Curious as to why only one dog gear has been machined? Quality issues?
It serves a critical gameplay function.

Just kidding. We didn't modify the dog gears, one of them came without Teflon coating on the cutout area.

ice.berg 07-02-2015 11:04
Re: pic: One robots worth of gears
 
Quote:
Originally Posted by Bryce Paputa (Post 1439637)
It serves a critical gameplay function.

Just kidding.
:eek:

You had me worried there for a minute!

Just curious if you were having the same problem we have had.

In the past we have had to do some tune up on some of the AndyMark Dog gears. We found that they weren't concentric and all 3 faces weren't engaging at the same time. This caused excess stress and mushrooming on one of the faces.

Chris is me 07-02-2015 18:24
Re: pic: One robots worth of gears
 
My concern wouldn't be the amount you took out of the middle section (I bet you could even go to 1/8" thick there if you really wanted to live on the edge), but how little material you left around the hex hub. There are parts where the corner of the hex appears to be less than 1/16" from the edge of the material, and that's really concerning to me. Would hate to see a stress fracture there. I know the little raised surface on the gear only extends out that far, but that part of the gear isn't sized that way for strength; it's sized that way to interact with bearing races.

This is more gut paranoia than actual analysis though; perhaps you'll be fine.

Other than that, looks great. Gear lightening is an often overlooked way to save some pounds.

zsm150 07-02-2015 22:25
Re: pic: One robots worth of gears
 
Teaser #2 it lives...

http://imgur.com/pQj13TU

Cory 08-02-2015 01:48
Re: pic: One robots worth of gears
 
Quote:
Originally Posted by Chris is me (Post 1439897)
My concern wouldn't be the amount you took out of the middle section (I bet you could even go to 1/8" thick there if you really wanted to live on the edge), but how little material you left around the hex hub. There are parts where the corner of the hex appears to be less than 1/16" from the edge of the material, and that's really concerning to me. Would hate to see a stress fracture there. I know the little raised surface on the gear only extends out that far, but that part of the gear isn't sized that way for strength; it's sized that way to interact with bearing races.

This is more gut paranoia than actual analysis though; perhaps you'll be fine.

Other than that, looks great. Gear lightening is an often overlooked way to save some pounds.
Looks pretty similar to hub size on gears we've pocketed previously. Obviously the loading matters but it's probably not a huge concern.

Bryce Paputa 15-02-2015 23:27
Re: pic: One robots worth of gears
 
Here are some pictures of the second robot progress over the past week.

ice.berg 15-02-2015 23:31
Re: pic: One robots worth of gears
 
HOLY PICTURES BATMAN! :eek:

But I dig the design. Looks like a PTO from what I can make out for some intake/lift device. Looks solid!


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