My modified weld together OSG

[Kevin powers]

So I changed the front and rear support plates, the front and rear pivot plates, the motor side plates and the tracking arm.
I will be welding most of the chassis together so getting rid of a lot of the holes reduced my cut time significantly.
The left and right sides were changed removing a lot of the metal below the bottom tooling arm. Added slots, changed the tracking arm pivot location 4" further back and 1" higher to accommodate a gas shock in lieu of springs.
The front and rear pivot plates were changed to accommodate welding.
The front and rear support plates were shortened 1" to bring the overall height of the machine down.
The tracking arm was changed to use the gas shock and still be relatively parallel when a belt is installed.
Here's a YouTube video of the model
https://youtu.be/U0sdgxTCIrU
Here's the parts I cut tonight. I should have them mostly welded up by tomorrow night.

[admin]

Very cool Kevin!

Are you going to be able to upload the CAD file(s) when it's all done?

Dan

[Kevin powers]

Sure that won't be an issue. I can even upload the nested file.

[Kevin powers]

Got the main chassis and the base fit and welded up a bit. The base hole were too tight on my cut. My fault, I should've double checked their size before cutting it. I ended up cutting new front and rear supports without the locators. When I did that I accidentally grabbed 1/2" instead of 3/8". So then the chassis wouldn't fit on to the base. Cut the rear pivot tab off and scooted it back 1/4" and welded it into place. Got the aluminum spacers cut out, milled to size and drilled. I'm going to bolt them in with ss hex panhead 1/4-20's. Tapped the holes for the arm and table locks. Fit the motor up and even slid my new drive wheel on to check things out. This is not the motor I will be using for this project. I have to go to the surplus yard and find another one. The shaft has runout on it and I'm going to try and find a motor that is strictly face mount. I can use the old motor on my mill. So that's Day 2 progress.

[Kevin powers]

Today I ball milled the aluminum spacers so the tooling arms slide easy. It really helped as aluminum doesn't like to slide against aluminum, especially if both surfaces are flat.

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Then I turned some delrin down to make washers for the tracking arm. I made these about .115" thick and made one for each side of the arm. Then I turned an aluminum spacer for the tracking arm.

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This setup allows me to get the arm really tight. Something I always hated about my eerf grinder. Kudos dan for making the grinder double shear in this area!
I then turned a tracking knob out of the same aluminum stock I had on hand. Since it already had a 1/2" hole for the tracking pivot I just counterbored a 5/16" carriage bolt I had in a box. Not the prettiest design but works. I have to make a handle for the tracking arm, a locking mechanism for the tilt function and line the wheels up. Should be up and running this coming week.

[Kevin powers]

Dan,
Do you have pics of how you spaced the tracking wheel away from the bracket?
I started spacing my contact wheel and platen out but the seem way out there.
https://youtu.be/joFBjcngY0s

[jjs4x4]

Wow Kevin that looks great! Do you have any video of it in operation? Are you running a VFD?

Jason

[Simko]

Kevin.. Have you had a chance to put together a download for the weld-together plans. A friend and I are both getting ready to build a 2x72 grinder and really like the changes that you made to the original plans.

I built a 5x10 CNC plasma table so we are going to use that to do the cutting. Not quite as accurate as waterjet, but its 'free'. I will just have to open up the slots and holes slightly due to the bevel of the plasma cut.

[Simko]

I ended up taking the SR2 prints and modifying them for welding. The biggest change, other than getting rid of a ton of clearance/threaded holes, was the front and back hinge plate.

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[bladesmithereen]

Kevin,

Are you still planning on posting your files?

Best Regards,
Michael