Jig for threading turned box and lid

This is a forum for intermediate to advanced woodworkers. Show off your projects or share your ideas.

Moderators: HopefulSSer, admin

User avatar
STB
Gold Member
Posts: 270
Joined: Thu Feb 24, 2011 12:26 pm
Location: Boulder City NV/Keno OR

Jig for threading turned box and lid

Post by STB »

My version of A shop-built jig for threading lids on turned boxes. The picture is of a box and lid used for proof of concept, and it works but needs a couple of tweaks for the final version. Suggestions wood be helpful.
testp2.jpg
testp2.jpg (385.32 KiB) Viewed 1757 times
Glenn
I create problem solving challenges and opportunities for design modification, not mistakes.

SS 520 born 04/16/03, Power Station mounted Band saw , Scroll saw, Jointer, Belt sander, Overarm router, dedicated Mark V drill press, SS Maxi-clamp system, Shopsmith woodworking bench
User avatar
JPG
Platinum Member
Posts: 34610
Joined: Wed Dec 10, 2008 7:42 pm
Location: Lexington, Ky (TAMECAT territory)

Re: Jig for threading turned box and lid

Post by JPG »

A courser pitch feed screw?

I like what you have done.
╔═══╗
╟JPG ╢
╚═══╝

Goldie(Bought New SN 377425)/4" jointer/6" beltsander/12" planer/stripsander/bandsaw/powerstation /Scroll saw/Jig saw /Craftsman 10" ras/Craftsman 6" thicknessplaner/ Dayton10"tablesaw(restoredfromneighborstrashpile)/ Mark VII restoration in 'progress'/ 10
E[/size](SN E3779) restoration in progress, a 510 on the back burner and a growing pile of items to be eventually returned to useful life. - aka Red Grange
User avatar
BuckeyeDennis
Platinum Member
Posts: 3683
Joined: Tue Jul 24, 2012 10:03 pm
Location: Central Ohio

Re: Jig for threading turned box and lid

Post by BuckeyeDennis »

That’s pretty slick! What’s the material that you’re threading? I understand that fine-grained hardwoods are best for threading.

What are you looking to improve with the tweaks?

If tearout on the threads is the problem, you could try stabilizing the wood prior to milling the threads, using multiple passes to cut the thread to full depth, or maybe experiment with different thread mills.
User avatar
STB
Gold Member
Posts: 270
Joined: Thu Feb 24, 2011 12:26 pm
Location: Boulder City NV/Keno OR

Re: Jig for threading turned box and lid

Post by STB »

JPG wrote: Sat Mar 11, 2023 10:48 pm A courser pitch feed screw?

I like what you have done.
That's definitely on the tweak list.
Glenn
I create problem solving challenges and opportunities for design modification, not mistakes.

SS 520 born 04/16/03, Power Station mounted Band saw , Scroll saw, Jointer, Belt sander, Overarm router, dedicated Mark V drill press, SS Maxi-clamp system, Shopsmith woodworking bench
User avatar
STB
Gold Member
Posts: 270
Joined: Thu Feb 24, 2011 12:26 pm
Location: Boulder City NV/Keno OR

Re: Jig for threading turned box and lid

Post by STB »

BuckeyeDennis wrote: Sat Mar 11, 2023 11:19 pm That’s pretty slick! What’s the material that you’re threading? I understand that fine-grained hardwoods are best for threading.

What are you looking to improve with the tweaks?

If tearout on the threads is the problem, you could try stabilizing the wood prior to milling the threads, using multiple passes to cut the thread to full depth, or maybe experiment with different thread mills.
I tried several things spindle speed, feed rate, cut depth, applying minwax wood hardener, and a few other things. That's the reason the test pieces are so short I cut off the failures. One of my problems was that I used 5/8 all thread and it is a little under 5/8 diameter so my chuck was not stable. I think a 3/4 all thread with the end turned to the Quill diameter might work. I was also thinking CA glue to stabilize the threads but mine is dried up. The cheapest thread mill is around $45 and go up from there. Some harder wood with a denser grain is a good suggestion.
Glenn
I create problem solving challenges and opportunities for design modification, not mistakes.

SS 520 born 04/16/03, Power Station mounted Band saw , Scroll saw, Jointer, Belt sander, Overarm router, dedicated Mark V drill press, SS Maxi-clamp system, Shopsmith woodworking bench
User avatar
algale
Platinum Member
Posts: 4793
Joined: Thu Nov 04, 2010 8:13 am

Re: Jig for threading turned box and lid

Post by algale »

I like that too! What kind of bit are you using in the chuck to cut the threads??
Gale's Law: The bigger the woodworking project, the less the mistakes show in any photo taken far enough away to show the entire project!

User avatar
STB
Gold Member
Posts: 270
Joined: Thu Feb 24, 2011 12:26 pm
Location: Boulder City NV/Keno OR

Re: Jig for threading turned box and lid

Post by STB »

algale wrote: Sun Mar 12, 2023 10:13 am I like that too! What kind of bit are you using in the chuck to cut the threads??
It is a thread mill bit typically used in vertical mills.
Glenn
I create problem solving challenges and opportunities for design modification, not mistakes.

SS 520 born 04/16/03, Power Station mounted Band saw , Scroll saw, Jointer, Belt sander, Overarm router, dedicated Mark V drill press, SS Maxi-clamp system, Shopsmith woodworking bench
Hobbyman2
Platinum Member
Posts: 2660
Joined: Wed Feb 01, 2017 12:52 am
Location: Ohio

Re: Jig for threading turned box and lid

Post by Hobbyman2 »

Very nice, how are you doing with the threads and chip out with that bit ? if it is excessive would a less aggressive bit make any difference ?
Hobbyman2 Favorite Quote: "If a man does his best, what else is there?"
- General George S. Patton (1885-1945)
User avatar
STB
Gold Member
Posts: 270
Joined: Thu Feb 24, 2011 12:26 pm
Location: Boulder City NV/Keno OR

Re: Jig for threading turned box and lid

Post by STB »

Hobbyman2 wrote: Sun Mar 12, 2023 12:56 pm Very nice, how are you doing with the threads and chip out with that bit ? if it is excessive would a less aggressive bit make any difference ?
As for chipout All my trials have been with the workpiece at 90 to the bit. I think my next try will be with the workpiece canted so only the face of the bit is cutting. I do not understand less aggressive bit. Do you mean less flutes?
Glenn
I create problem solving challenges and opportunities for design modification, not mistakes.

SS 520 born 04/16/03, Power Station mounted Band saw , Scroll saw, Jointer, Belt sander, Overarm router, dedicated Mark V drill press, SS Maxi-clamp system, Shopsmith woodworking bench
User avatar
BuckeyeDennis
Platinum Member
Posts: 3683
Joined: Tue Jul 24, 2012 10:03 pm
Location: Central Ohio

Re: Jig for threading turned box and lid

Post by BuckeyeDennis »

I just thought of another issue. Studying the pic of your setup, it appears that the bit is climb cutting. I’ve experimented with both climb and conventional cuts on my CNC router. The best technique for me seems to be to do roughing passes with a climb cut, followed by a light finishing pass with a conventional cut. So you might try a light finish pass while threading out — that should give you a conventional cut on that pass.
Post Reply