It arrived today with USPS Priority Mail, 16 days after I won the eBay aution. It cost AU$225 plus 72 for the postage. The chuck with collet set weighs 5.8kg without the package. Condition is excellent, there appears to be no wear, it definitely has not been used much at all. There is just surface discoloration from the thickened up protective oil, and some dust. I am sure it will clean up well. The mechanism moves freely and everything is as it is supposed to be. I am very happy.
The backplate adapter is for a threaded spindle nose 1-1/2x8TPI. Not sure yet what I do. I could bore it out and rethread 1-3/4x8TPI for the Hercus 260. Or make a new backplate and sell the original one, there is a drawing with the Jacobs chuck manual how to make a new backplate. Or modify an existing 260 backplate.
Here some pics how it looks right out of the box:
01_DSCF0250.JPG
Not bad, considering they stopped making these collet chucks some 15 years ago. No idea how old this particular one is, but could potentially be from the 50's.
03_DSCF0252.JPG
02_DSCF0251.JPG
04_DSCF0253.JPG
Interesting: yhe 0.1-0.2" collet only has four ribs, so its also suitable to clamp square stock. No idea why this is so though....
05_DSCF0255.JPG
Collets are almost unused. The rubber has not perished, no surface cracks. They were obviously properly stored away from sunlight.
06_DSCF0257.JPG
The three threaded studs that engage with the nosepiece are driven via gears by the large black handwheel. That makes for fast opening/closing of the collet. To firmly clamp down a workpiece, the three studs have an internal socket for an allen key.
07_DSCF0258.JPG
08_DSCF0259.JPG
This is a link to the operation manual for this chuck:
http://ift.tt/Zr8ioM
The chuck itself mounts with 6 allen screws to the backplate, and these are used to dial the chuck for minimum TIR when it is mounted for the first time.
Jacobs_500_series_collets.jpg
These are the dimensions of the 500 series Rubberflex collets as used with the model 50 collet chuck.
These chucks and collets do regularly pop up on American eBay, so are not hard to come by. They were very common in the US back at the times where manual lathes were in fashion, 50's to early 90's. Prices vary with condition, US$ 200 to 300 are common for this chuck with a complete collet set, one gets pretty much what one pays for. The main problem is that the rubber in the collets will perish if stored many years in sunlight or/and exposed to solvents. Affected collets show fine surface cracks in the rubber, just like an old perished tractor tyre does. New collets can still be bought, but cost from US$50 upwards each.
The backplate adapter is for a threaded spindle nose 1-1/2x8TPI. Not sure yet what I do. I could bore it out and rethread 1-3/4x8TPI for the Hercus 260. Or make a new backplate and sell the original one, there is a drawing with the Jacobs chuck manual how to make a new backplate. Or modify an existing 260 backplate.
Here some pics how it looks right out of the box:
01_DSCF0250.JPG
Not bad, considering they stopped making these collet chucks some 15 years ago. No idea how old this particular one is, but could potentially be from the 50's.
03_DSCF0252.JPG
02_DSCF0251.JPG
04_DSCF0253.JPG
Interesting: yhe 0.1-0.2" collet only has four ribs, so its also suitable to clamp square stock. No idea why this is so though....
05_DSCF0255.JPG
Collets are almost unused. The rubber has not perished, no surface cracks. They were obviously properly stored away from sunlight.
06_DSCF0257.JPG
The three threaded studs that engage with the nosepiece are driven via gears by the large black handwheel. That makes for fast opening/closing of the collet. To firmly clamp down a workpiece, the three studs have an internal socket for an allen key.
07_DSCF0258.JPG
08_DSCF0259.JPG
This is a link to the operation manual for this chuck:
http://ift.tt/Zr8ioM
The chuck itself mounts with 6 allen screws to the backplate, and these are used to dial the chuck for minimum TIR when it is mounted for the first time.
Jacobs_500_series_collets.jpg
These are the dimensions of the 500 series Rubberflex collets as used with the model 50 collet chuck.
These chucks and collets do regularly pop up on American eBay, so are not hard to come by. They were very common in the US back at the times where manual lathes were in fashion, 50's to early 90's. Prices vary with condition, US$ 200 to 300 are common for this chuck with a complete collet set, one gets pretty much what one pays for. The main problem is that the rubber in the collets will perish if stored many years in sunlight or/and exposed to solvents. Affected collets show fine surface cracks in the rubber, just like an old perished tractor tyre does. New collets can still be bought, but cost from US$50 upwards each.
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