How to DIY a Radius Platen - Theory

[Brock Cutlery]

I haven't done this yet. But it is pretty cheap to build, and I expect I will be making myself some platens using this theory.

I'm thinking I'll use standard 1/2 inch square tubing from Home Depot.
Not sure I will need the side brace tubing, but it's probably a good idea, which means some welding or other creative attaching.

In theory you should be able to create any radius you like based on the length of the tubing you use.
Draw and rough grind the radius squarely on your proposed platen first, which should make the actual grinding on the tube jig minimal. Just use it to true up the radius.

1. Cut out your platen to desired dimensions.
2. Drill and tap your platen for your grinder mounts.
3. Draw the radius you want and rough grind it flat on your grinder workrest.
4. Attach to the jig and clean and refine the radius.
5. Send to heat treat.
6. Create wonderful knife bevels with your desired radius.

This should be pretty darned cheap, and you can make as many as as varied a set of platens as you like.
Figuring a way to move the pivot on the tube is what allows you to set the radius you like.
It could be as simple as a pin with squarely drilled holes in the tubing.

Let me know what you think!

 

[rubencete]

interesante,estare atento a esto

 

[kuraki]

Ah now I get it. You could use that setup to make sanding blocks for hand sanding hollows too.

 

[Stacy E. Apelt - Bladesmith]

That is how many woodworkers get repeatable curves on chair parts and such. It is a lot more work in steel, but doable.

 

[Natlek]

That is how many woodworkers get repeatable curves on chair parts and such. It is a lot more work in steel, but doable.

Angle grinder can help if he cut corners .I do something like this on disk sander , little smaller radius but it works . . .