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DIY interchangeable tool rest

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Forum topic by Jack Lewis posted 01-14-2017 03:49 PM 1739 views 0 times favorited 9 replies Add to Favorites Watch
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Jack Lewis

326 posts in 1223 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.

-- "PLUMBER'S BUTT! Get over it, everybody has one"


9 replies so far

View Wildwood's profile

Wildwood

2423 posts in 2279 days


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

Looks good, nice job!

-- Bill

View Bill7255's profile

Bill7255

427 posts in 2429 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 Woodknack's profile

Woodknack

12369 posts in 2524 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.

-- Rick M, http://thewoodknack.blogspot.com/

View OSU55's profile

OSU55

1862 posts in 2134 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

326 posts in 1223 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.

-- "PLUMBER'S BUTT! Get over it, everybody has one"

View MrUnix's profile

MrUnix

6928 posts in 2343 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

326 posts in 1223 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.

-- "PLUMBER'S BUTT! Get over it, everybody has one"

View BDH's profile

BDH

1 post in 282 days


#8 posted 01-09-2018 12:37 PM

Jack – I have the same lathe, and same frustration with the post diameter. Thinking of doing the same thing you did. It’s been a year since you built it. Are you happy with the design? What would you change?

View Jack Lewis's profile

Jack Lewis

326 posts in 1223 days


#9 posted 01-09-2018 02:52 PM



Jack – I have the same lathe, and same frustration with the post diameter. Thinking of doing the same thing you did. It s been a year since you built it. Are you happy with the design? What would you change?

- BDH


I use them almost exclusively when bowl turning. I would use 5/8” round stock for the rest bar. I am also having made a 2” wide “L” shaped 8” x 2” x 1/2” thick flat topped rest where the short leg offsets the post by 2” for bowl bottoms. I hate chatter when the tool hangs over the rest so far. It will attach to the same post.

-- "PLUMBER'S BUTT! Get over it, everybody has one"

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