how do you hold pins in?

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Posted by Brian at 1/27/2001 5:37 PM EST


Student on team #670, HHSRC, from Homestead High School.



We put some pins in and they don't stay in? We can't come up with ideas, but they aren't legal. Please help us.

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Posted by Ken Leung at 1/27/2001 6:06 PM EST


Student on team #192, Gunn Robotics Team, from Henry M. Gunn Senior High School.


In Reply to: how do you hold pins in?
Posted by Brian on 1/27/2001 5:37 PM EST:



: We put some pins in and they don't stay in? We can't come up with ideas, but they aren't legal. Please help us.

What kind of pin setup are you talking about? I am assuming you are talking about putting pin through shaft to lock sprocket in, or similar setup. And I am also assuming your pins are not spring pin or something like that...

So normally when you put a pin through a shaft, you can bend it at the both end (if it's long enough) so it won't slip out, or use some kind of shaft collar to hold it in. If you are using a spring pin, it's supposed to hold in, unless the hole is too large.

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Posted by Ken Wilson at 1/27/2001 6:10 PM EST


Engineer on team #248, FEMEX, from Philadelphia Girls High and PECO Energy Company.


In Reply to: how do you hold pins in?
Posted by Brian on 1/27/2001 5:37 PM EST:



: We put some pins in and they don't stay in? We can't come up with ideas, but they aren't legal. Please help us.

The drilled holes for solid pins should be the exact size as the pin - if it's slightly loose, you can use Loctite for cylindrical fits - it's a fastener and legal.

KJ TEAM 248

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Posted by Mark Garver at 1/27/2001 7:20 PM EST


Student on team #68, Truck Town Terror, from Waterford Kettering/OSMTech Academy and General Motors Truck Group.


In Reply to: Re: how do you hold pins in?
Posted by Ken Wilson on 1/27/2001 6:10 PM EST:



If I remember correctly, I believe the pins are 3mm x 15mm. If you can't find the 15mm you can use 16mm and they work fine.

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Posted by nick237 at 1/27/2001 8:25 PM EST


Engineer on team #237, sie h2o bots, from Watertown high school ct and sieman co.


In Reply to: how do you hold pins in?
Posted by Brian on 1/27/2001 5:37 PM EST:



Brian. Do you have any toolmakers or machinests on your team, they would know how to retain a pin in a hole.
assuming you dont then you could use a hardened bolt with a lock nut on it if you have the room.
Drilling holes through a shaft tends to weaken the rod and braking of the shaft at the drill area is possible with the high pushing powers need for this years games.
A key way is the best way but must be done by a qualified person.
nick237 ( nothings impossible )( except picking your nose with your elbow :)


: We put some pins in and they don't stay in? We can't come up with ideas, but they aren't legal. Please help us.