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Threaded brass inserts for urn

John Tisdale

John Tisdale

Joined
Apr 11, 2014
Messages
459
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Location
Dallas, TX
I've seen several posts regarding 4"-dia threaded brass inserts for urns - weren't germane to my efforts until now - I have an urn to make for a friend's mom.
So I'm soliciting some advice.
QUESTIONS / COMMENTS:
  • There are a few sources on 4" schedule-40 - I think the 0.236" thick walls would allow female and male threads - anybody played with schedule 40, 4"-dia brass?
  • I think sand-casting would be viable - could do a thicker wall - I would think that the optimum lot size would be 12-pcs or more per shot.
Looking forward to your comments.
 
John Tisdale said:
I've seen several posts regarding 4"-dia threaded brass inserts for urns - weren't germane to my efforts until now - I have an urn to make for a friend's mom.
So I'm soliciting some advice.
QUESTIONS / COMMENTS:
  • There are a few sources on 4" schedule-40 - I think the 0.236" thick walls would allow female and male threads - anybody played with schedule 40, 4"-dia brass?
  • I think sand-casting would be viable - could do a thicker wall - I would think that the optimum lot size would be 12-pcs or more per shot.
Looking forward to your comments.
Click to expand...
But that pipe is like $250.00 a foot!
 
John Tisdale said:
There are a few sources on 4" schedule-40 - I think the 0.236" thick walls would allow female and male threads - anybody played with schedule 40, 4"-dia brass?
Click to expand...
If I am reading this correctly it would look like you would need the ability to cut both male and female threads in schedule 40 brass pipe so if that is correct you would need some pricy equipment to cut those threads. If you have a metal lathe that would have the ability to cut the threads then you are close to having everything you need to cut the threads directly into the wood. The only thing necessary to convert the metal lathe for cutting threads in wood is an adapter to mount your wood turning chuck and a small router mounted on the cross slide. The photo below is cutting a female thread into a birch urn and of course the male thread for the lid can also be accommodated with the same setup. This setup also allows you to use whatever thread pitch the metal lathe is capable of being set for. The Lablond lathe that I have is capable of cutting down to 4 TPI but the thread pictured is probably 11TPI. If enough people are interested I could start a thread about this technique. IMG_0858.JPG
 
It would be cheaper to pay a machinist to cut the threads than it would be to buy a metal lathe. If you buy the Baxter threader for your lathe you can cut the threads in wood using your wood lathe. I thought the discussion was about adding g metal threads. I use the Baxter threader all the time. Excellent machine and will.cut threads in any wood. Www.bestwoodtools.com
 
You can turn brass, copper, aluminum on a wood lathe, no problem, with regular plain old everyday wood lathe tools (thread chasers from Sorby, etc) so I'd imagine you could chase your threads on your wood lathe too, so why would one want to get a metal lathe? Myself, I have yet to get a set of sorby thread chasers but when I finally do (read: when I have the free cash for it) I plan to learn thread chasing by hand.. then I don't even need to worry about getting an exact size opening , all I would need is to match my lid size to opening size.
 
john lucas said:
It would be cheaper to pay a machinist to cut the threads than it would be to buy a metal lathe. If you buy the Baxter threader for your lathe you can cut the threads in wood using your wood lathe. I thought the discussion was about adding g metal threads. I use the Baxter threader all the time. Excellent machine and will.cut threads in any wood. Www.bestwoodtools.com
Click to expand...
I see that Baxter makes an 8TPI head for their machine which is desirable for large diameter threads to accommodate the loose tolerance that is necessary in wood, however it also stated that it could cut threads only up to 3 inch diameter which is obviously short of 4".
Also consider the problem of mounting a say 10" tall urn with a 4" diameter opening on that small fixture then advancing it into the cutting tool by turning that knurled knob by hand = excessive vibration.
 
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You can always fabricate a wood base that fits your lathe ways and mount the baxter threader to the custom base to gain the distance you need for turning a larger diameter threads.
Or some of the other threading jigs that mount on the lathe banjo can be easily adjusted for cutting larger threads.
 
john lucas said:
It would be cheaper to pay a machinist to cut the threads than it would be to buy a metal lathe. If you buy the Baxter threader for your lathe you can cut the threads in wood using your wood lathe. I thought the discussion was about adding g metal threads. I use the Baxter threader all the time. Excellent machine and will.cut threads in any wood. Www.bestwoodtools.com
Click to expand...
I have been looking (drooling over) the one from chefWareKits. I think they are having a slight discount during the virtual symposium.
 
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