performers.net forums  

Go Back   performers.net forums > GENERAL DISCUSSIONS... > TOOLS OF THE TRADE

Reply
 
Thread Tools Search this Thread Display Modes
Old 04-23-09, 09:37 AM   #1
Evan Young
Senior Member
 
Evan Young's Avatar
 
Join Date: May 2001
Location: Mid Atlantic (PA)
Posts: 1,002
Send a message via AIM to Evan Young
Default Aluminum Rola Bola Tube

This is a question about weights/strength.
I'm having an aluminum rola bola tube made for my "airplane" set of props.
I got a quote for a 9" Diameter, x 1/4" wall thickness x 13" length for a total weight of 9 lbs. I'd like it if I could get it down to 6lbs, but I don't think that'll be possible.
The machine shop told me they could machine down the wall thickness to be 3/16ths" for an approximate weight of 6.5 lbs, but it wouldn't be as strong... I don't know if it'll be strong enough, and neither do they.
I could chop an inch off the length I guess...

k, what's your advice. I don't want to make a mistake here, this thing isn't going to be cheap.
__________________
--EvAN--

ka-pow!
www.globalevan.com
www.showoffshow.com
www.evanshotme.com
Evan Young is offline   Reply With Quote
Old 04-23-09, 09:56 AM   #2
gav
Senior Member
 
Join Date: Apr 2003
Location: zagreb
Posts: 916
Default

I'd just take the inch off the length, or maybe 2 depending how big your foot and/or your board is.
gav is offline   Reply With Quote
Old 04-23-09, 12:56 PM   #3
Frisbee
Senior Member
 
Frisbee's Avatar
 
Join Date: Dec 2000
Location: San Francisco, CA
Posts: 753
Default

Can you drop the diameter by an inch, I would make it 8" in daimeter and cut an inch off the length. I do not think you want to make it thinner as that will hurt the integrety

-Greg
__________________
_____________________________
THE GREG FRISBEE SHOW
Comedy Juggler | Variety Performer

www.FrisbeeShow.com
_____________________________
Frisbee is offline   Reply With Quote
Old 04-24-09, 08:02 AM   #4
Steven Ragatz
Senior Member
 
Steven Ragatz's Avatar
 
Join Date: Feb 2001
Location: Indiana, USA
Posts: 493
Default

Check in with Thayr Harris. He hangs out here on P.net and I know he uses aluminum tubes for some major rola bola action.

I have not used metal, but have made do with large PVC tubes by putting ends on them to add support. I used half inch ply disks inset in the tube to help them keep a good shape. It is a balance whether or not the additional material to add structure makes up for the material you could take off, but it is worth consideration.

Keep in mind that if you are using tubes that are oriented vertically, the walls would not have to be as strong since there is little lateral pressure. The rollers shouldn't compress, but I would think the stacking tubes could be thinner. If you want to remove material, you could take out holes from the sides and make them 'circus' styled. It looks kinda disco in my opinion, but it would cut down on weight quite a bit.

Steven Ragatz
Steven Ragatz is offline   Reply With Quote
Old 04-24-09, 09:38 AM   #5
Jim
Your Host
 
Jim's Avatar
 
Join Date: Dec 2000
Location: Boston, MA USA
Posts: 1,093
Blog Entries: 6
Default

9" tube? That's huge. I've been using a 6" for over 10 years and it's just about perfect. Why are you using a 9"?

I just had this conversation with Dave Aiken. He was going to have the machinist bore out a ton of holes in his tube to make it look like swiss cheese, but the machinist told him it would be way cheaper to mill it down to a thinner wall. In the end, I don't think he did anything.

Try a smaller diameter tube and shave an inch or so off the end and see where that gets you.

If it's your "travel" tube, cutting a couple inches off the diameter shouldn't affect the show, visually, and it should save you a bunch of weight.
__________________
Jim is offline   Reply With Quote
Old 04-24-09, 12:43 PM   #6
Evan Young
Senior Member
 
Evan Young's Avatar
 
Join Date: May 2001
Location: Mid Atlantic (PA)
Posts: 1,002
Send a message via AIM to Evan Young
Default

re: why 9" tube
The pvc pipe I stole from a constuction site 7 years ago is 9" and I think it kicks ass. Too bad it's 12 lbs.


I'm looking into an 8" diameter tube to save on weight. The machine shop said it should be a little less money as well.
__________________
--EvAN--

ka-pow!
www.globalevan.com
www.showoffshow.com
www.evanshotme.com
Evan Young is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 09:47 PM.


Powered by vBulletin® Version 3.8.1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.