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Still battling with my chuck

 

Okay, I have gotten to the point where I actually need to remedy my issue. The 3-jaw chuck on my Lot 4 is not longer able to hold stock true enough that I can’t make up the difference with one of my other lathes. I work on very small parts and often use the Dalton to rough in larger material that I can finish up on a smaller lathe. From what I can tell, the jaws on the chuck no longer grip the workpiece evenly. Typically I turn most of the surfaces down to spec and then cut the part off. However, yesterday, I needed to use the whole OD of a piece of stock and turn a small shaft down in the center. When I parted the piece off and put it in my other lathe, I noticed how off the chuck was.

I use this lathe about 3 times a day. Can anyone recommend a specific model of chuck that they have had success replacing the original one with? I’d love to have one that can be dialed in to perfection like the Bison Set-Tru series. My lathe has the standard 3-hole mounting plate and an MT3 taper in the headstock. I was looking to see if there was a collet solution that might work with that.

Is there any way to keep the original going? It’s looking pretty worn, but it’s led a good life. :)

Thanks,

Ryan
Manchester, MA
 

Just a thought, but have you considered re-mounting the back plate? Good luck fixing it

On Oct 8, 2024, at 2:59 PM, Ryan Bardsley via groups.io <rbardsley@...> wrote:

Okay, I have gotten to the point where I actually need to remedy my issue. The 3-jaw chuck on my Lot 4 is not longer able to hold stock true enough that I can’t make up the difference with one of my other lathes. I work on very small parts and often use the Dalton to rough in larger material that I can finish up on a smaller lathe. From what I can tell, the jaws on the chuck no longer grip the workpiece evenly. Typically I turn most of the surfaces down to spec and then cut the part off. However, yesterday, I needed to use the whole OD of a piece of stock and turn a small shaft down in the center. When I parted the piece off and put it in my other lathe, I noticed how off the chuck was.

I use this lathe about 3 times a day. Can anyone recommend a specific model of chuck that they have had success replacing the original one with? I’d love to have one that can be dialed in to perfection like the Bison Set-Tru series. My lathe has the standard 3-hole mounting plate and an MT3 taper in the headstock. I was looking to see if there was a collet solution that might work with that.

Is there any way to keep the original going? It’s looking pretty worn, but it’s led a good life. :)

Thanks,

Ryan
Manchester, MA
 

Great idea, GP

I actually spent a good amount of time tap tap tapping that thing with a dial indicator attached to one of those calibration shafts held in the chuck. My think was that might do the trick, but it really seems that either the scroll or the jaws themselves are worn beyond the point of no return. The jaws don’t seem to come apart from the chuck either. Is the only way to true them to bring them in situ? I read that you can put a ring around the jaws to provide uniform(ish) preload on the jaws/scroll and then bring them. That seems awfully risky.

R

On Oct 8, 2024, at 6:18?PM, Grey Pilgrim via groups.io <pilgrim23@...> wrote:

?Just a thought, but have you considered re-mounting the back plate? Good luck fixing it

On Oct 8, 2024, at 2:59 PM, Ryan Bardsley via groups.io <rbardsley@...> wrote:

Okay, I have gotten to the point where I actually need to remedy my issue. The 3-jaw chuck on my Lot 4 is not longer able to hold stock true enough that I can’t make up the difference with one of my other lathes. I work on very small parts and often use the Dalton to rough in larger material that I can finish up on a smaller lathe. From what I can tell, the jaws on the chuck no longer grip the workpiece evenly. Typically I turn most of the surfaces down to spec and then cut the part off. However, yesterday, I needed to use the whole OD of a piece of stock and turn a small shaft down in the center. When I parted the piece off and put it in my other lathe, I noticed how off the chuck was.

I use this lathe about 3 times a day. Can anyone recommend a specific model of chuck that they have had success replacing the original one with? I’d love to have one that can be dialed in to perfection like the Bison Set-Tru series. My lathe has the standard 3-hole mounting plate and an MT3 taper in the headstock. I was looking to see if there was a collet solution that might work with that.

Is there any way to keep the original going? It’s looking pretty worn, but it’s led a good life. :)

Thanks,

Ryan
Manchester, MA
 

I did that once with a badly worn chuck. ?The procedure written up in some of the machine reconditioning books; may also be On Line in a video somewhere. ?You make a ring that will encircle the projections on the three jaws, put it over the jaws and open the jaws until they are tight against the ring. ?Then you spin the chuck while going in with a small stone on a long shaft on your tool post grinder, gradually dialing it out until the inside of the jaws are sparking evenly all the way around and the whole length of the gripping surfaces.
?
The jaws will now be trued up when a piece is clamped into them, but of course you are limited as to the diameter of the workpiece since there will be more or less of a gap in the center when the jaws are closed. ?If you are doing (as you say) very small parts, they may no longer be gripped by the jaws. ?On the other hand, if the runout cleans up by only a few thousandths of this grinding, or you are making small parts by roughing them out of bigger diameter workpieces, you may be able to pull it off.
 

Hy Ryan
Sorry for the late reply.? ? As to chucks for Daltons.? Lot 2 3 4 and 5 came from the factory with four inch three jaw chucks and five inch four jaw chucks.? There are a lot of good import chucks available in these sizes but the biggest problem you will face is a back?plate to mount them.? Dalton's 1 1/4 - 12 spindle nose is a bastard sort of and there are no commercially available?back plates to be had.? So if the one your current chuck is on is not usable on a new chuck you will have to make a new one from scratch.? I have made a couple in the past. but requires a much larger lathe than the small Daltons.? A Lot 6 or Dalton 9 could handle the job or something the size of a 9 inch South Bend. Also you will have to go to a material outlet to find a piece of cast iron. What you need to do Ryan is find or make a friend that has a larger lathe and is willing to make you a new back plate.? At one time in the past I did know a guy that was having lathe parts made in China.? I provided him with a drawing and he had a sample run of 15 back? plates made and he offered them on eBay like all the rest of the parts he was having made.? Problem was he was only able to sell five or six over a period of two years so?he did not have any more made.? I did end up with most of them but they have long been sold to Dalton owners though I did use several of them myself.? Was kind of sad that that project failed as the back plates were really well made from good material.? Pictures are of a back plate I made for John Glands Lot 4 restoration.? This was over 20 years ago and poor John plassed on two years ago and have no idea of what ever happened to his lathe.

On Tue, Oct 8, 2024 at 3:00?PM Ryan Bardsley via <rbardsley=[email protected]> wrote:
Okay, I have gotten to the point where I actually need to remedy my issue. The 3-jaw chuck on my Lot 4 is not longer able to hold stock true enough that I can’t make up the difference with one of my other lathes. I work on very small parts and often use the Dalton to rough in larger material that I can finish up on a smaller lathe. From what I can tell, the jaws on the chuck no longer grip the workpiece evenly. Typically I turn most of the surfaces down to spec and then cut the part off. However, yesterday, I needed to use the whole OD of a piece of stock and turn a small shaft down in the center.? When I parted the piece off and put it in my other lathe, I noticed how off the chuck was.

I use this lathe about 3 times a day. Can anyone recommend a specific model of chuck that they have had success replacing the original one with? I’d love to have one that can be dialed in to perfection like the Bison Set-Tru series. My lathe has the standard 3-hole mounting plate and an MT3 taper in the headstock. I was looking to see if there was a collet solution that might work with that.

Is there any way to keep the original going? It’s looking pretty worn, but it’s led a good life. :)

Thanks,

Ryan
Manchester, MA




4 jaw back plate in 4 jaw chuck.JPG
3 Jaw back plate only needs final machining.JPG
Back side of 4 jaw.JPG
Copy of J Gs lathe almost done.JPG

 

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I have the same problem. My original chuck is badly bell shaped in the jaws. Now around .010” runout. Terrible concentricity.

I found a backing plate on eBay that has a 1” threaded hole in the center. I figure it is possible to bore out and cut threads for 1 1/4” -12.

But, not sure what the beveled angle needs to be on the shoulder of the backing plate - the part that slips into the recess in the new chuck.

Glenn P. in Woodinville, Wa?




On Oct 17, 2024, at 10:08?AM, Dennis Turk <dennisturk448@...> wrote:

?
Hy Ryan
Sorry for the late reply.? ? As to chucks for Daltons.? Lot 2 3 4 and 5 came from the factory with four inch three jaw chucks and five inch four jaw chucks.? There are a lot of good import chucks available in these sizes but the biggest problem you will face is a back?plate to mount them.? Dalton's 1 1/4 - 12 spindle nose is a bastard sort of and there are no commercially available?back plates to be had.? So if the one your current chuck is on is not usable on a new chuck you will have to make a new one from scratch.? I have made a couple in the past. but requires a much larger lathe than the small Daltons.? A Lot 6 or Dalton 9 could handle the job or something the size of a 9 inch South Bend. Also you will have to go to a material outlet to find a piece of cast iron. What you need to do Ryan is find or make a friend that has a larger lathe and is willing to make you a new back plate.? At one time in the past I did know a guy that was having lathe parts made in China.? I provided him with a drawing and he had a sample run of 15 back? plates made and he offered them on eBay like all the rest of the parts he was having made.? Problem was he was only able to sell five or six over a period of two years so?he did not have any more made.? I did end up with most of them but they have long been sold to Dalton owners though I did use several of them myself.? Was kind of sad that that project failed as the back plates were really well made from good material.? Pictures are of a back plate I made for John Glands Lot 4 restoration.? This was over 20 years ago and poor John plassed on two years ago and have no idea of what ever happened to his lathe.

On Tue, Oct 8, 2024 at 3:00?PM Ryan Bardsley via <rbardsley=[email protected]> wrote:
Okay, I have gotten to the point where I actually need to remedy my issue. The 3-jaw chuck on my Lot 4 is not longer able to hold stock true enough that I can’t make up the difference with one of my other lathes. I work on very small parts and often use the Dalton to rough in larger material that I can finish up on a smaller lathe. From what I can tell, the jaws on the chuck no longer grip the workpiece evenly. Typically I turn most of the surfaces down to spec and then cut the part off. However, yesterday, I needed to use the whole OD of a piece of stock and turn a small shaft down in the center.? When I parted the piece off and put it in my other lathe, I noticed how off the chuck was.

I use this lathe about 3 times a day. Can anyone recommend a specific model of chuck that they have had success replacing the original one with? I’d love to have one that can be dialed in to perfection like the Bison Set-Tru series. My lathe has the standard 3-hole mounting plate and an MT3 taper in the headstock. I was looking to see if there was a collet solution that might work with that.

Is there any way to keep the original going? It’s looking pretty worn, but it’s led a good life. :)

Thanks,

Ryan
Manchester, MA




<4 jaw back plate in 4 jaw chuck.JPG>
<3 Jaw back plate only needs final machining.JPG>
<Back side of 4 jaw.JPG>
<Copy of J Gs lathe almost done.JPG>

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