CB350 Project

What size holes did you drill?
I'm pretty sure 1-1/2" is maximum safe size
Looks like you polished inside the holes to prevent cracks forming?
I use a small 120 grit flap wheel in die grinder with some brown polishing compo
BTW, I originally found ventmasters, RGRH posted in his build
http://www.dotheton.com/forum/index.php?topic=16574.50
 
crazypj said:
What size holes did you drill?
I'm pretty sure 1-1/2" is maximum safe size
Looks like you polished inside the holes to prevent cracks forming?
I use a small 120 grit flap wheel in die grinder with some brown polishing compo
BTW, I originally found ventmasters, RGRH posted in his build
http://www.dotheton.com/forum/index.php?topic=16574.50
Click to expand...

Yup 1.5" Holes is what I drilled. Any bigger and it would cut away parts of the structure inside. The holes were measured and drilled between the inside supports. Yup I smoothed out the inside of the holes as well.
 
Probably don't want to go as far as I did, took ages to do
There isn't much you can do to make rear look good though
http://www.dotheton.com/forum/index.php?topic=11736.100
almost bottom of page
 
Finally got some time to work on my own projects. Shock plates and mounts cut, just got to machine down the ends for the shock eyes.

Shock Mounts.jpg
 
Tool post on the lathe snapped but it was 50 yrs old haha. Got a new tool post and machined the shock mounts. Almost ready to weld up the entire frame.

Shock Mount.jpg
 
Any more photos of your rear shock mounts? I was going to skip the 1" diameter step and just butt the shock eye against the plate. Can you think of any downside to doing it this way?
 
Ppleasants said:
Any more photos of your rear shock mounts? I was going to skip the 1" diameter step and just butt the shock eye against the plate. Can you think of any downside to doing it this way?
Click to expand...

The 1" mount area just allows for more weldable surface. You just have to make sure the shock eye and top of the shock clears everything. I drilled a hole in the plate about 1/2" big and welded it from the back side also.
 
MotoMadness said:
The 1" mount area just allows for more weldable surface. You just have to make sure the shock eye and top of the shock clears everything. I drilled a hole in the plate about 1/2" big and welded it from the back side also.
Click to expand...

Thanks for the input. I ended up keeping the 1" step. I drilled a 7/8" hole because my plate wasn't completely perpendicular to the axis of the shock mount so I just dremeled it out to 1" on the correct axis. Did what you said and welded it from the front and rear of the plate so it shouldn't be going anywhere.

You can see a little bit of my welds in the picture. Fortunately, throughout this project my welding has improved exponentially so when I got to the really structural parts, I was confident enough in their strength.
 

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