specialist chuck threads

[JWD]

hi folks, hoping someone can share some info with me!
I have a woodfast lathe w/ a M30 x 3.5mm thread, R+L handed

I purchased a RS patriot to use on the lathe( M33x3.5 w/ appropriate insert), which has been excellent for the inboard side, but having recently acquired some 24" sycamore pieces id like to give a go to the outboard side.
Does anyone know where i would be able to get a RS patriot compatible insert with a M30 x 3.5 left hand thread so i could use the RS on the outboard side as well?

Many thanks for your help

J

 

[CHJ]

No Idea, but do you have an outboard Faceplate?

 

[JWD]

yes sir, i do! what are you eluding to?
thanks for the reply
Joe

 

[Duncan A]

hi folks, hoping someone can share some info with me!
I have a woodfast lathe w/ a M30 x 3.5mm thread, R+L handed

I purchased a RS patriot to use on the lathe( M33x3.5 w/ appropriate insert), which has been excellent for the inboard side, but having recently acquired some 24" sycamore pieces id like to give a go to the outboard side.
Does anyone know where i would be able to get a RS patriot compatible insert with a M30 x 3.5 left hand thread so i could use the RS on the outboard side as well?

Many thanks for your help
J

The RS Patriot does not have a M33 insert. It is either direct threaded or has an excert. If you gave an excert, RS do a M30 x 3.5mm insert but you would have to keep swapping the insert and excert around. A right royal pain! You would probably be better off buying a Compatriot with the appropriate M30 insert or a Record Power SC4 chuck with a M30 insert - and the SC4 chuck does also take a M33 insert if you later wanted to use one. The jaws on the Patriot and SC4 are compatible with one another.
Duncan

 

[JWD]

perhaps my explanation was poor- the RS patriot comes with a M33 or 1.5"x6 ready tapped thread and i opted for the M30x3.5 insert in order to use it on my machine. what i need is an insert with an M30x3.5 thread but in Left hand configuration so i can use it on the outboard side of the machine.

Cheers
Joe

 

[TFrench]

The patriot chuck comes in m33x3.5, 1 1/2"x6 and insert thread. The insert type is not either of those two - I can't remember the exact pitch. I very much doubt they make a M30 LH thread - you would probably have to get a machinist make one for you. Or use a faceplate as Chas said. (People did turn before chucks were invented)

 

[CHJ]

No Idea, but do you have an outboard Faceplate?

The help sticky has a couple of links to turning bowls with faceplates if you do not have chucks.

 

[chaoticbob]

The patriot chuck comes in m33x3.5, 1 1/2"x6 and insert thread. The insert type is not either of those two - I can't remember the exact pitch. I very much doubt they make a M30 LH thread - you would probably have to get a machinist make one for you.
...

I'n not a woodturner (yet!) but I'm interested, so dip a toe in this part of the forum occasionally. I do dabble with metal turning though, and this caught my interest. Even if it were possible to machine such an insert (I'm assuming we're talking about 30x3.5 LH internal thread, 33x3.5 RH external) surely that would effectively replace the LH thread on the outboard end of the spindle with an RH thread? Which would rather defeat the purpose of having an LH thread on the outboard end - wouldn't the chuck just unwind unless you cut from the back of the lathe? Apologies if I've misunderstood and am talking pineapples!
From the machining point of view it's hard to see how such an insert could be made. A 3.5mm pitch 60 degree metric thread has a depth of about 3mm. I assume the30/33 RH/RH insert which the OP has is machined so the internal and external threads are in registration - otherwise the the threads would break through into each other. Obviously that couldn't be done with different handed threads on the inside and outside.
Robin.

 

[JWD]

Bob - thanks for your interest
I understand your point, given the two thread sizes are not too dissimilar and would be in opposing directions i'd imagine there would be some conflict.
perhaps i could have a new part, the same profile as the RS backplate machined with the outboard thread on as an excert? Again i suck at explaining this but i actually think this would work but would certainly be a custom job.

 

[Duncan A]

Another option would be to buy an insert for your chuck to suit a small spindle size e.g. 3/4" and have it machined LH M30 x 3.5mm to suit your outboard spindle. The insert would fit your chuck OK, although you might need to make doubly sure that the insert doesn't unwind in use.
Duncan

 

[TFrench]

The patriot chuck comes in m33x3.5, 1 1/2"x6 and insert thread. The insert type is not either of those two - I can't remember the exact pitch. I very much doubt they make a M30 LH thread - you would probably have to get a machinist make one for you.
...

I'n not a woodturner (yet!) but I'm interested, so dip a toe in this part of the forum occasionally. I do dabble with metal turning though, and this caught my interest. Even if it were possible to machine such an insert (I'm assuming we're talking about 30x3.5 LH internal thread, 33x3.5 RH external) surely that would effectively replace the LH thread on the outboard end of the spindle with an RH thread? Which would rather defeat the purpose of having an LH thread on the outboard end - wouldn't the chuck just unwind unless you cut from the back of the lathe? Apologies if I've misunderstood and am talking pineapples!
From the machining point of view it's hard to see how such an insert could be made. A 3.5mm pitch 60 degree metric thread has a depth of about 3mm. I assume the30/33 RH/RH insert which the OP has is machined so the internal and external threads are in registration - otherwise the the threads would break through into each other. Obviously that couldn't be done with different handed threads on the inside and outside.
Robin.

You're right - it would create a right hand thread that would need to be locked on somehow. It wouldn't be m30 to m33 though - it's m30 to the insert thread (which I still haven't looked up!) Probably still a bit close and an excert would be better.

Sent from my SM-G950F using Tapatalk

 

[chaoticbob]

JWD's Patriot has an M33x3.5 RH internal thread - Sorby make a variety of inserts including one to bring the internal thread down to M30x3.5 RH which is what JWD must have to suit the Woodfast lathe spindle. Further thought confirms (to my mind anyhow!) that if it were possible to make such an insert with opposed threads it would be so fragile (because the roots of the external thread, at 27mm diameter, would cut through the roots of the 30mm internal thread) as to be useless. So in reply to the original question, I doubt that this is the way to go! Can't see why an excert (learned a new word there!) with some sort of lock wouldn't work though, if the lathe is beefy enough to cope with the extra overhang.
Sorry if I'm barging in, I know next to nowt about woodturning lathes, but the engineering part of this interested me. And I'm thinking maybe someday I'll get a wood lathe...
Robin

 

[marcros]

JWD's Patriot has an M33x3.5 RH internal thread

No it isn't. If it is the patriot that takes the insert it is a different body to the M33 one. There is ALSO a version that is threaded M33. Different models of the same chuck.

 

[chaoticbob]

Thanks for the clarification marcros - having looked Poolewood's website I see what you mean. I perhaps misinterpreted the description in the original post:

...
I purchased a RS patriot to use on the lathe(M33x3.5 w/ appropriate insert),
...
J

which made me think the OP's chuck had an M33 x 3.5 internal thread. Do you know what the actual thread size on the outside of the insert is? Apart from curiosity my reason for asking is that I might possibly be able to help the OP out - being retired and having time on my hands, I sometimes make non-standard parts for people just for the pleasure of it.
Robin

 

[TFrench]

Took a bit of googling but I found this that says the nova insert chucks are 1 1/2" x8 UNC

 

[Robbo3]

There is also a warning about using Nova chucks with inserts in reverse (just reinforcing what was said earlier in this thread).
NOVA Insert Chucks and lathes in reverse
- https://s3.amazonaws.com/cdn.freshdesk. ... tion%2Fpdf