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DIY interchangeable tool rest

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Forum topic by Jack Lewis posted 01-14-2017 03:49 PM 862 views 0 times favorited 7 replies Add to Favorites Watch
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Jack Lewis

208 posts in 911 days


01-14-2017 03:49 PM

Background:
I have a Grizzly G0766 lathe, with a 22” x 42” capacity. The banjo has a 25MM tool post hole. There are no suitable aftermarket tool rests available. Standard tool rests are total inadequate to do all but the most elementary turning. I am bored with elementary turnings.
Solution:
I searched for answers to being able to support a gouge deep inside of a hollowing. One that would allow me to make the “one last cut” without a catch or castystrophic failure in the chuck. I don’t like having a blank rocketting toward me. It hurts! I found one company that sold Modular “Interchangeable tool Rests”, where the rest portion was interchangeable with the tool post. “Great idea”, is said.I could have the right rest for the situation at hand and change to a different rest when the situation changed. Alas, it didn’t fit my lathe and naturally was very costly because they held all the cards. Re=engineer their’s or make my own? I sat at my CAD program and doodled until a way to manufacture what was needed without needless and very expensive machineing or casting of parts. I purchased 25 mm round stock for the post and much cheaper 1” round stock for the rest, some 3/4” heavy duty nuts and 2 inch bolts and designed this system. Now I have a rest with upto interchangeable 8-12 inch depth outside or inside of my hollowing with a curved, straight or any other configuration necessary that supports my tools. Some welding, some grinding, I can now vary the depth of the tool rest from the post. I tapered the under side of both the top bar and the gusset so I could place the rest closer to the bottom of the hollowing. Shown is the curved rest plan and example.

-- "Now we are getting no where, thanks to me"


7 replies so far

View Wildwood's profile

Wildwood

2186 posts in 1967 days


#1 posted 01-14-2017 04:18 PM

Looks good, nice job!

-- Bill

View Bill7255's profile

Bill7255

412 posts in 2117 days


#2 posted 01-14-2017 04:26 PM

You did a good job. However Robust has the rest you made and they will make it with the 25mm post. I don’t have the grizzly, but have the PM 90 that has a 1 1/8 post. I had Robust make me 5 post after I raised my lathe. I bought both the inside bowl rest, outside bowl rest, “J” rest and two straight rest. Of course not inexpensive, but a very good value. I really do like the Robust rest.

-- Bill R

View Rick_M's profile

Rick_M

10598 posts in 2213 days


#3 posted 01-15-2017 06:15 PM

Can you not just use 7/8” posts? I believe it was Sears who used a banjo that size.

I like your ingenuity though.

-- http://thewoodknack.blogspot.com/

View OSU55's profile

OSU55

1420 posts in 1822 days


#4 posted 01-17-2017 01:17 PM

Nice flexible design. As an alternative, Its very easy to enlarge the tool post bore to 1”. 25 vs 25.4mm is only 400 um or .016”, .008” wall thickness. A 1” drill bit in a hand drill will do it. Mostly removine burrs and hi spots from the surface, at least thats how mine was.

View Jack Lewis's profile

Jack Lewis

208 posts in 911 days


#5 posted 01-19-2017 03:45 AM



Can you not just use 7/8” posts? I believe it was Sears who used a banjo that size.

I like your ingenuity though.

- Rick M


I tried that and was not confident of a stable rest without an additional locking fastener.

-- "Now we are getting no where, thanks to me"

View MrUnix's profile

MrUnix

5973 posts in 2031 days


#6 posted 01-19-2017 04:06 AM

Cool project, but I’m not sure I see the advantage… Why did you decide to go this route, rather than just weld up a solid tool rest in the shape you desired with the round bar stock you had?

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

View Jack Lewis's profile

Jack Lewis

208 posts in 911 days


#7 posted 01-19-2017 02:53 PM



Cool project, but I m not sure I see the advantage… Why did you decide to go this route, rather than just weld up a solid tool rest in the shape you desired with the round bar stock you had?

Cheers,
Brad

- MrUnix

1. The additional nut allows me to change the amount of overhang when inside of a bowl.
2. I have several configurations for the top rest, e.i. straight, curved, short, etc.
3. This fits both Grizzly lathes I own.
4. Doesen’t require any accurate machining.
5. Besides welding, I can accomplish new designs as needed.
6. I am a DIY as much as I can.

-- "Now we are getting no where, thanks to me"

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