Today in the shop (lathe tool modification)

reible · Post by **reible** » Sun Mar 30, 2014 6:54 pm

How about taking one of my old shopsmith lathe chisels I have and changing it shape from a skew to a rounded skew. Sounds like fun?

I have an extra one of these but even I mess it up they are not all that expensive to replace.

(515026) http://www.shopsmith.com/ownersite/cata ... elsind.htm

Rounded skew is another tool on my list of things I'd like to try, but again I'm at a loss as to what makes one version different then another version. So this is the ED version.

At this point I will just show the results, if others are truly interested I can show the set up but if you don't have the hardware it would we way cheaper to just the lathe tool.

Pictured below are the stock chisel and then the new curved version.

[ATTACH]24532[/ATTACH]

Here is another shot of the new tool.

[ATTACH]24533[/ATTACH]

I still have to sharpen it as this is straight off the 80 grit wheel. Also need to round the edges of the blade.....

Ed

wa2crk · Post by **wa2crk** » Sun Mar 30, 2014 7:34 pm

Ed
Are you using any kind of jig to do your sharpening?
Bill V

reible · Post by **reible** » Mon Mar 31, 2014 11:59 am

This is the jig I used:

http://www.leevalley.com/en/wood/page.a ... 3072,45938

Along with this attachment:

http://www.leevalley.com/en/wood/page.a ... at=1,43072

Ed

benush26 · Post by **benush26** » Mon Mar 31, 2014 12:31 pm

Ed,
Are the angles closer to 30 degrees? Seems like more.

How long does it stay sharp?

Be well,
Ben

reible · Post by **reible** » Mon Mar 31, 2014 2:02 pm

Hi,

I have not looked at the angle. If the existing shopsmith tool is 30 degrees then from the photos the new angle is not even close to 30 degrees.

It has not be sharpened yet so I can't answer much more about that yet.

Since this is a ED tool the angle might be way off. I was watching a British guy doing some cool stuff and the tool he was using seemed to have the longer angle so while I didn't have any guidance other then a video to look at I went that way.

As I think I've mentioned I'm no lathe expert. I have a desire to expand my knowledge in that area and somethings I'm playing with is getting a collection of lathe tools that I can make or modify then the ones I can't I'll purchase.

These posts are intended to give you follow woodworkers some ideas of what can be done at home. If you want to have a 30 degree angle then that is what you could set the gauge up and do it that way.

Ed

benush26 wrote:Ed,
Are the angles closer to 30 degrees? Seems like more. How long does it stay sharp?

Be well,
Ben

rpd · Post by **rpd** » Mon Mar 31, 2014 6:02 pm

While you are trying different shapes and angles on the skews, Cap'n Eddie recommends a convex edge as easier to control.

shaprskew.avi

reible · Post by **reible** » Mon Mar 31, 2014 6:56 pm

Got out to the shop for a short while and checked the angle, It is pretty much on 25 degrees.

I also shot a picture showing that this was a flat grind, not concave, not convex just flat.

[ATTACH]24538[/ATTACH]

I will have to check out the video again, I've watched it before but I don't recall all the details. I do believe he is showing a rounded edge skew in this video so I have had no experience with this sort of tool and I will most likely purchase one rather then modifying anything I have.

Ed

benush26 · Post by **benush26** » Mon Mar 31, 2014 10:47 pm

reible wrote:Got out to the shop for a short while and checked the angle, It is pretty much on 25 degrees.

I also shot a picture showing that this was a flat grind, not concave, not convex just flat.

Ed

Thanks Ed. Now I have to dig out my SS chisel to see what degree it is versus what I thought I was grinding!?!

A friend taught me to but a convex edge on by making a windshield wiper motion with the handle while I held the blade flat against the tool rest. The
"pivot point" was the back edge of the tool rest. Side of my index finger against the back of the tool rest while my thumb presses down on the chisel. making my thumb as the pivot. I use the SS grinding jig for all the other SS chisels (actually all non carbide tipped chisels), but cannot duplicate the action on that jig.

Thanks again!

Be well,
Ben

beeg · Post by **beeg** » Tue Apr 01, 2014 3:48 pm

From various sources. The bevel should be about 40° or one and one half the length of the thickness of the tool. From toe to heel it should be about 70°. On the rounded skew, the rounded portion should be on the lower third.

JPG · Post by **JPG** » Tue Apr 01, 2014 4:39 pm

beeg wrote:From various sources. The bevel should be about 40° or one and one half the length of the thickness of the tool. From toe to heel it should be about 70°. On the rounded skew, the rounded portion should be on the lower third.

That mean 2/3 of it is straight?

40 degrees would be about 1 1/2 times half the thickness(IIUC).