Hello! Log in or Register   |  Help  |  Donate  |  Buy Shirts  See all banner ads | Advertise on TheSamba.com  
TheSamba.com
 
Farm Boy Chassis Rotisserie
Forum Index -> Beetle - Late Model/Super - 1968-up Share: Facebook Twitter
Reply to topic
Print View
Quick sort: Show newest posts on top | Show oldest posts on top View previous topic :: View next topic  
Author Message
baxsie
Samba Member


Joined: August 09, 2005
Posts: 599
Location: Eastern Washington State
baxsie is offline 

PostPosted: Sun Oct 07, 2012 8:24 pm    Post subject: Farm Boy Chassis Rotisserie Reply with quote

I was reading Hondapop's 75 Super elecric vehicle (ev) build, and I instantly liked the Chassis Rotisserie he had borrowed from his local club.

I had always thought of a car rotisserie in terms of what you would need for a US automobile . . . kind of a fully framed structure where the front and back are connected. I had never thought of just letting the frame/chassis of the bug be the "axle" of the rotisserie.

Well we have a lot of chassis work coming up on the 1975 LaGrande Super Beetle project, and my son needed some welding time, so I bought some square tubing and we put this together:
Image may have been reduced in size. Click image to view fullscreen.


95% of the welding here was done by my son, which probably tripled his experience with the welder. I did a bit of the fussy parts at the clamp.

The construction is fairly simple.

The mounting of the axle to the chassis must be solid. In the back I used some 3"x1/2" strap, and that is still a bit on the flexy side. The front uses 2" square tubing (capped for rigidity) and 2" x 1/2" strap.

I wanted the rotation to be smooth, and I wanted to be able to lock the rotation firmly. To this end, I used 2" 0.120" wall DOM tubing for the outer sleeve, which has a nominal inside diameter of 1.760". The inner tube is 1.75" OD, which leaves a tight 0.010 tolerance. Surprisingly, the de-burred tubing slides nicely one over the other. Well, that is BEFORE welding. After welding, we had to work quite a while with a cylinder hone to remove the imperfections created by the heat of welding.

It was a lot of work, and about did theat cheap HFT hone in, but having the nice close tolerance allowed us to make a clamp that works great.

OK, here is a dump of the construction photos.

Fitting the massive 1/2" x 3" rear strap:
Image may have been reduced in size. Click image to view fullscreen.


Mitering the outer pivot sleeve to the apex of the frame:
Image may have been reduced in size. Click image to view fullscreen.


Welding the inner pivot to the rear strap. That is my son's work with the MIG. The stop collar is already in place :
Image may have been reduced in size. Click image to view fullscreen.


We used the cutoff saw and Dremel to slot the pipe for the clamp. We intentionally left the bridge until after welding/honing so stuff would stay lined up:
Image may have been reduced in size. Click image to view fullscreen.


Clamp fitting before welding. 1/2" square nut fits great in the 1" square tubing:
Image may have been reduced in size. Click image to view fullscreen.


Shot of the finished clamp:
Image may have been reduced in size. Click image to view fullscreen.


Here is the assembled rear pivot and clamp:
Image may have been reduced in size. Click image to view fullscreen.


This is the front brace, ready to have the inner pivot welded to it. Keep in mind that it does not sit perfectly flat . . .there is like a 4 degree slope that we compensated for with a slight angle cut on the inner pivot tube:
Image may have been reduced in size. Click image to view fullscreen.


Test of the rotational holding ability of the clamps:
Image may have been reduced in size. Click image to view fullscreen.


Another (now boring) check of the rotational holding ability of the clamps:
Image may have been reduced in size. Click image to view fullscreen.
Back to top
View user's profile Send private message Gallery Classifieds Feedback
mgamike
Samba Member


Joined: August 07, 2010
Posts: 390
Location: Michigan
mgamike is offline 

PostPosted: Sun Oct 07, 2012 8:46 pm    Post subject: Reply with quote

Very nice. What size MIG welder did you use?
_________________
77 Convertible
Back to top
View user's profile Send private message Gallery Classifieds Feedback
baxsie
Samba Member


Joined: August 09, 2005
Posts: 599
Location: Eastern Washington State
baxsie is offline 

PostPosted: Sun Oct 07, 2012 8:48 pm    Post subject: Reply with quote

It is a "Millermatic® 211 Auto-Set™ with MVP™":

http://www.millerwelds.com/products/mig/product.php?model=M00245

Image may have been reduced in size. Click image to view fullscreen.
Back to top
View user's profile Send private message Gallery Classifieds Feedback
Q-Dog
Samba Member


Joined: April 05, 2010
Posts: 7235
Location: Sunset, Louisiana
Q-Dog is offline 

PostPosted: Mon Oct 08, 2012 4:01 am    Post subject: Reply with quote

Nice work. That should make things a bit easier.
_________________
Brian

'69 Dune Buggy
'69 Beetle Convertible
'70 Beetle
Back to top
View user's profile Send private message Gallery Classifieds Feedback
Display posts from previous:   
Reply to topic    Forum Index -> Beetle - Late Model/Super - 1968-up All times are Mountain Standard Time/Pacific Daylight Savings Time
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

About | Help! | Advertise | Donate | Premium Membership | Privacy/Terms of Use | Contact Us | Site Map
Copyright © 1996-2020, Everett Barnes. All Rights Reserved.
Not affiliated with or sponsored by Volkswagen of America | Forum powered by phpBB