77ironhead
Titanium
- Joined
- Jan 22, 2006
- Location
- maryland
this may or may not get the lock- as I'm not asking advice, etc etc, mostly just a rant and fair warning:
we just received a pair of new Jacobs 14N chucks at work (first new ones since they offshored production to China), and the first one out of the box felt kind of 'gritty' when I ran the jaws in to mount an R8 taper. On closer examination:
1- grind grit caught in the assembly grease that was leaking out past the jaws
on dis-assembly for cleaning (who would have guessed dis-assemble on a brand-new Jacobs???)
2- burrs everywhere inside the chuck
3- the bores the jaws ride in had marginal honing, drill marks clearly visible
4- outer sleeve warped badly enough that it wasn't 'cleaned up' either on the inside or outside diameters
5- inside hone also went deeper than the journal portions enough so the sleeve body itself was compromised
6- the small flat on each of the jaws was different dimension from the others
7- the races that the roller bearings ride on both show dimples 60% around from the ball bearings
8- inadequate lubrication inside the chuck (reminded me more of the 'fish oil' the cheaper manufacturers use for lube than lithium grease)
9- what little bit of lube was present inside the chuck was contaminated by both grind grit and machining flakes
10- blatantly obvious that the ends of the jaws were ground after the chuck was assembled
11- after thoroughly cleaning all the crud, general 'tune up', and re-assembly, indicating a gage pin chucked up showed a .015 wobble (~.05 at the business end of a spotting drill), even though the chuck itself was spinning concentric to the spindle.....
the 2nd chuck showed similar 'outside' characteristics (poor workmanship and finish overall), but was somewhat smoother in action. A similar trip down 'indicator lane' showed .0025 wobble (worse out at the end of a chucked spotting drill).
the first chuck is going back to MSC, we're keeping the 'better' one, we needed them both, but are 'making do' with just one for now)
Rant: I remember when a new Jacobs was something the guys would fight over when bought.....kind of a shame another great manufacturing name has gone chinese, sacrificed on the altar of more profit. Really pisses me off to pay 'made in America' prices on chinese quality- and it wasn't even my money being spent!
we just received a pair of new Jacobs 14N chucks at work (first new ones since they offshored production to China), and the first one out of the box felt kind of 'gritty' when I ran the jaws in to mount an R8 taper. On closer examination:
1- grind grit caught in the assembly grease that was leaking out past the jaws
on dis-assembly for cleaning (who would have guessed dis-assemble on a brand-new Jacobs???)
2- burrs everywhere inside the chuck
3- the bores the jaws ride in had marginal honing, drill marks clearly visible
4- outer sleeve warped badly enough that it wasn't 'cleaned up' either on the inside or outside diameters
5- inside hone also went deeper than the journal portions enough so the sleeve body itself was compromised
6- the small flat on each of the jaws was different dimension from the others
7- the races that the roller bearings ride on both show dimples 60% around from the ball bearings
8- inadequate lubrication inside the chuck (reminded me more of the 'fish oil' the cheaper manufacturers use for lube than lithium grease)
9- what little bit of lube was present inside the chuck was contaminated by both grind grit and machining flakes
10- blatantly obvious that the ends of the jaws were ground after the chuck was assembled
11- after thoroughly cleaning all the crud, general 'tune up', and re-assembly, indicating a gage pin chucked up showed a .015 wobble (~.05 at the business end of a spotting drill), even though the chuck itself was spinning concentric to the spindle.....
the 2nd chuck showed similar 'outside' characteristics (poor workmanship and finish overall), but was somewhat smoother in action. A similar trip down 'indicator lane' showed .0025 wobble (worse out at the end of a chucked spotting drill).
the first chuck is going back to MSC, we're keeping the 'better' one, we needed them both, but are 'making do' with just one for now)
Rant: I remember when a new Jacobs was something the guys would fight over when bought.....kind of a shame another great manufacturing name has gone chinese, sacrificed on the altar of more profit. Really pisses me off to pay 'made in America' prices on chinese quality- and it wasn't even my money being spent!