The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > Info Center > FAQ Truck Tech > Engine and Drivetrain

Web 67-72chevytrucks.com


 
 
Thread Tools Display Modes
Old 05-04-2005, 10:09 AM   #1
ronh72c10
Senior Member
 
Join Date: Jul 2003
Location: Mount Forest, Ontario, Canada
Posts: 978
DIY Aluminum Hard Line Clamps

Here's how I made a set of aluminum hard line clamps for my tranny lines. The method is pretty low tech, I needed a drill press and belt sander, but I could see it being done with a regular handheld drill and a file or sanding block. These were made to fit a 5/16" tube but with different washers (more on that later) you can vary the tubing size or overall thickness of the clamp itself.

I imagine alot of people could free hand the profile of these clamps, I have no such skill so I used a little trick to make these in a repeatable fashion. Basically the secret of these is to choose a washer that has an outside diameter that corresponds to the curve of the edges and has an inside diameter that is the same size (or smaller) as the tubing you're using.

For these clamps I used 1/4" washers that had an ouside diameter of a little less than 3/4" and had an actual inner diameter of 5/16". There's no reason to use this exact size, for that matter you could use a bearing or "machinist's filing buttons" for this, the washers were low tech and cheap so I used them.
Attached Images
 
__________________
72 Chevy C10 (rust repaired, starting body work)
72 GMC 3/4ton 4x4
72 Chevy C20 Suburban
38 Ford Tudor Humpback Sedan (from the darkside)
67 Pontiac Parisienne
55 Studebaker Commander 2dr Hardtop (Starliner)
My Youtube channel with Video Updates!
ronh72c10 is offline  
Old 05-04-2005, 10:10 AM   #2
ronh72c10
Senior Member
 
Join Date: Jul 2003
Location: Mount Forest, Ontario, Canada
Posts: 978
I bought some aluminum flat bar 1"x3/8" by about 24" long, it cost about $8. If you don't want as deep a clamp you could certainly go smaller than 1". 3/8" is the critical dimension since it is approximately 1/2 of the 3/4" washer diameter. You don't want to go much thicker than 1/2 the diameter of the washers since you just end up sanding it off and that gets tedious.

Cut two pieces of bar approximately 1-1/2" long, mark a spot centered in the top piece and drill a 7/32" hole (1/4" tap size) through both keeping them clamped down and aligned. Too make it easier to bolt together I tapped the bottom of the clamp for a 1/4" screw. The top was drilled out to 1/4" and then counter sunk enough so the head of the bolt I used was below the surface of the top, I also cut the screw down such that it didn't protrude out the bottom. Dont' forget to deburr all holes so things clamp together tightly.
Attached Images
 
__________________
72 Chevy C10 (rust repaired, starting body work)
72 GMC 3/4ton 4x4
72 Chevy C20 Suburban
38 Ford Tudor Humpback Sedan (from the darkside)
67 Pontiac Parisienne
55 Studebaker Commander 2dr Hardtop (Starliner)
My Youtube channel with Video Updates!
ronh72c10 is offline  
Old 05-04-2005, 10:10 AM   #3
ronh72c10
Senior Member
 
Join Date: Jul 2003
Location: Mount Forest, Ontario, Canada
Posts: 978
Bolt the two pieces tightly together and mark on the side where you'd like the tubing to go through, use the washers as guides for a good location. Clamp the pieces in a vice and drill the holes, aiming for the seam between the two pieces, make sure to start out with a small drill bit and work your way up to the final size. (5/16" in my case) Deburr the holes from either side.

For the first two clamps I made I actually seperated the two pieces and used a file to make a groove to guide the drillbit, I tried one without doing this and it turned out fine, your mileage may vary.
Attached Images
 
__________________
72 Chevy C10 (rust repaired, starting body work)
72 GMC 3/4ton 4x4
72 Chevy C20 Suburban
38 Ford Tudor Humpback Sedan (from the darkside)
67 Pontiac Parisienne
55 Studebaker Commander 2dr Hardtop (Starliner)
My Youtube channel with Video Updates!
ronh72c10 is offline  
Old 05-04-2005, 10:11 AM   #4
ronh72c10
Senior Member
 
Join Date: Jul 2003
Location: Mount Forest, Ontario, Canada
Posts: 978
Using a long bolt (5/16"), place alot of washers on either side of the block and loosely bolt them on, the washers should rotate freely but not have alot of side play in them, use another nut to lock the bolt in place while still making sure that the washers can rotate. I used alot of washers because they tend to be slightly irregular, and using alot tends to average out the shape to a rough circle.

Finally using a belt sander I wore down the edges until the washers started contacting the belt, they keep you from going too far since they rotate and as a result wear alot more slowly than the aluminum. I started out with a 60 grit belt and then finished with a 120 grit belt. You don't necessarily need to use a belt sander, you could use a wide file or flat sanding block, just always go in a direction such that the washers will rotate.

After the shape was pretty much done I took the washers off and knocked down all of the sharp edges.

Polish and you're done. One note on polishing I used a green abrasive, but didn't wear a face shield, by the end of the evening I looked like Herman Munster. Use a face shield!

Also I decided to only use the halves to hold the tubing against the frame, but if you use the two pieces together you may have to sand the inner surfaces to clamp the tubing tight.

This should be adaptable for almost any size of tubing, you could also use this technique for more than two tubes. Have fun!
Attached Images
  
__________________
72 Chevy C10 (rust repaired, starting body work)
72 GMC 3/4ton 4x4
72 Chevy C20 Suburban
38 Ford Tudor Humpback Sedan (from the darkside)
67 Pontiac Parisienne
55 Studebaker Commander 2dr Hardtop (Starliner)
My Youtube channel with Video Updates!
ronh72c10 is offline  
Old 05-04-2005, 05:30 PM   #5
chief bobber
Sanity is a state of mind
 
chief bobber's Avatar
 
Join Date: Apr 2005
Location: New Humpshire
Posts: 93
First rate work! I think you did a beautiful job of custom fabricating these pieces, but I think you need to take it just a tad further to avoid the reaction between aluminum and the steel. You need to insulate between them some how. Even a coating of some kind will work. Anything to create some kind of barrier between the two metals.
Keep up the good work, KC
__________________
67 K-10 8ft step 250/465/timken 4 shaft/373 to 1
70 C-10 Panel Vortec V/5spd BW od /307 to 1
70 C-30 9ft stepside dump 350/465/ posi
and a few too many other trucks, cars, jeeps, cruisiers, and M/Cs

...o~`o
chief bobber is offline  
 

Bookmarks

Thread Tools
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 -4. The time now is 01:06 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com