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Unread 16-11-2014, 12:49
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Re: pic: new shoes

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Originally Posted by Oblarg View Post
I think it depends on what you mean by "meaningful quantity." If you're putting together a tube-and-gusset chassis, it's not all that difficult to do your riveting by hand. It's still faster than bolting the assembly together.

If you're doing sheet metal, I can see how it would be a real pain to have to do all your rivets manually.
We do tube and gusset for pretty much every system. We did't have a pneumatic riveter until 2011, and did hand until then.

It's certainly meaningful quantity, and it's certainly worth it. The time saved is huge.

I like to think of labor in terms of minimum wage. If the cost of a tool saves enough labor that it's "making" more than minimum wage, it's worth it (as our kids make well above minimum wage when they're out fundraising). The flipside is true too... any fabrication we do that "saves" less than minimum wage is a bad decision, and should be a COTS item.

Too many teams work themselves for below minimum wage.
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Unread 16-11-2014, 12:58
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Re: pic: new shoes

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Originally Posted by AdamHeard View Post
We do tube and gusset for pretty much every system. We did't have a pneumatic riveter until 2011, and did hand until then.

It's certainly meaningful quantity, and it's certainly worth it. The time saved is huge.

I like to think of labor in terms of minimum wage. If the cost of a tool saves enough labor that it's "making" more than minimum wage, it's worth it (as our kids make well above minimum wage when they're out fundraising). The flipside is true too... any fabrication we do that "saves" less than minimum wage is a bad decision, and should be a COTS item.

Too many teams work themselves for below minimum wage.
Unfortunately, the reality for many teams is that time spent is not some limitlessly fungible resource where any time saved in manufacturing can be converted to money through fundraising efforts.
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Unread 15-11-2014, 13:22
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Re: pic: new shoes

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Originally Posted by 75vs1885 View Post
on the original wheel , did you only rivet once? When we try the rivets are not reliable. We know why, but have a difficult time mastering riveting!!
Large head rivets work really well for securing tread. Otherwise, just be sure you're putting rivets in the "dip" of the tread as much as you can and use all of them. Going to steel isn't really much help and it just makes changing tread a ton harder. You just need the rivets to last as long as the tread.
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Unread 15-11-2014, 14:50
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Re: pic: new shoes

Quote:
Originally Posted by 75vs1885 View Post
on the original wheel , did you only rivet once? When we try the rivets are not reliable. We know why, but have a difficult time mastering riveting!!
We used a little bit of glue too. Ours were on there pretty tight. Steel rivets helps as opposed to aluminium. We had an all aluminum rivet robot last year and we ended up popping the rivets left and right (especially in high impact/stress areas)(at least the rivets broke and not the frame itself).
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