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Gallery, Projects and General => How do I?? => Topic started by: Mike K on April 06, 2021, 09:45:05 PM

Title: How do I get one of these triangular straight edges?
Post by: Mike K on April 06, 2021, 09:45:05 PM

Or, rather, where?  Do they still make 'em?  Probably ridiculous to make oneself?

 

Title: Re: How do I get one of these triangular straight edges?
Post by: mattinker on April 07, 2021, 07:00:03 AM

Mike

I found one in a second-hand tool dealer just north of Paris, un-scraped! extremely cheap! How about a piece of darabar? Not ridiculous at all to make one if you have a mill. When I bought mine, I thought about milling a 45° on one corner, I didn't need to as the dovetails that I will be using it on are 60°.

Cheers, Matthew

Title: Re: How do I get one of these triangular straight edges?
Post by: Mike K on April 07, 2021, 09:15:52 AM

Thanks Matthew.

Unfortunately, my only milling machine is the mini mill.  I plan to use it to true up my mini lathe.

-Mike

Title: Re: How do I get one of these triangular straight edges?
Post by: Pete. on April 07, 2021, 12:58:18 PM

I tried to make one of those by milling 3 sides of a round cast iron bar. It bent like a banana.

I would look to getting one cast. It's not a difficult shape for casting.

Title: Re: How do I get one of these triangular straight edges?
Post by: Mike K on April 07, 2021, 03:51:43 PM

And then scrape it in, using my 12"x18" surface plate for reference?

Title: Re: How do I get one of these triangular straight edges?
Post by: awemawson on April 07, 2021, 04:21:48 PM

With a bit of effort you could slice that from square cast iron stock on a band saw, and hand file to an approximation before scraping as it's not a huge area.

Leave it a while after sawing to relax it's internal stresses before filing. Wet and dry on a bit of plate glass in decreasing coarseness's will get you even closer.

OK it's a lot of work but eminently doable with limited machining capabilities.

Title: Re: How do I get one of these triangular straight edges?
Post by: Peter Cordell on April 07, 2021, 04:30:29 PM

I made a short one a few years ago from a piece of old cast iron, that bent as i milled it.
So i did a little stress relief, heated it to 600c let it soak 2 hours lowered it to 500c let it soak 2 hours and so on
Was fine after that

Title: Re: How do I get one of these triangular straight edges?
Post by: Mike K on April 07, 2021, 08:24:09 PM

All good ideas.  Thanks guys!

Title: Re: How do I get one of these triangular straight edges?
Post by: WeldingRod on April 08, 2021, 10:47:22 AM

Sawing is a great way to start!  Definitely roast it as hot as you can manage before you start!(https://uploads.tapatalk-cdn.com/20210408/68cfe7b59b1fc4a84b7051a45b3262b7.jpg)

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