We have been doing a bit of mail exchange lately so not much has been posted.
But we agreed that we should post the contents.
It’s in reverse but here it goes.
I thought about it some more and think its ok if the motors are held
only by the clamp on the back end of the motors. The motors are 41mm
long and if the wheel extends back ~30mm from the shaft end that leaves
plenty of space to "grip" the motors and hold everything securely. I
also figured out a way to make the clamp myself but it would have to be
I figure I can bore out ~23mm to fit over the motors, leaving 7mm at the
end to secure to the motor shaft. I make that at 5,553 cubic
millimetres. That would give 14.9g for aluminum and 46.5g for brass. So
quite a bit of difference and it might be that the brass is too heavy.
What do you think?
No problem posting to the forum. I'll pick up on the forum if you post
this stuff there.
Stig Ankjær Pedersen wrote:
Well. i think i can get close enough to make it work. Maybe we will
need an additional cross member (is that right) on top of the motors to
make sure they stay level? what do you think?
If the "cross member" is to be installed im thinking a hight of about
1.5mm which would then leave a wheel inner diameter of about 16mm if
we have a 1.5mm clearance. Provided that the motors are actually 13mm
diameter as stated.
I had originally targeted the entire wheel to be 25mm with a 2.5mm
"rubber" coating so if we go for that we shold get something like a
My math isn't really good enough to come up with an estimate on the
weight off that.
I was also thinking about doing the bottom plate out of mild steel
instead of aluminium to add weight plus it would keep a low centre off
Just for kicks i did a fast calculation on the weight if we where to
do the bottom plate in Tungsten.
270 something grams
Last but not least. would you mind if i posted our mails on the forum?
it's been a while now.
----- Original Message ----- From: "Bob Cook" <firstname.lastname@example.org
To: "Stig Ankjær Pedersen" <email@example.com
Sent: Sunday, November 11, 2007 11:13 PM
Subject: Re: Joint Strike Rims
Opps, I hit send before typing anything!
I spent a couple of hours on the lathe today. I ended up scrapping the
piece I was working on. I did however learn a few things, and I have
concluded that your clamp is a much better way to mount the motors, as
there won't be enough clearance for the T style bracket I had
envisioned. The only problem is that I can't fabricate it! Can you?
I eventually got a Banebots account set up and placed my order. My
motors should arrive in the next week or so.
Stig Ankjær Pedersen wrote:
Funny thing… i replied to the forum before i saw your mail.
In the forum i wrote i didn’t really have a plan which is not entirely
accurate. I just think we should get as much input as possible. (you
know… two minds are usually better that one). I’m having trouble
visualizing the T frame so if you could explain it a bit more detailed
i would really appreciate it.
Anyway here’s what i had in mind. Just securing it to the bottom plate