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Thread: Which Chuck
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30th June 2009, 12:38 AM #61
Ern,
Does this mean that at worst, at 10x the depth of the Titan chuck the wobble is 5 thou, which is 0.15mm if I'm not mistaken. In other words, if your Titan chuck is 5cm from front to rear, then at 50cm from the rear of your chuck, your job is 0.15mm off axis. I would have thought even double that would be a negligible wobble. (unless my maths has failed me here.).
Anyway, sounds to me that you got your Nova chuck problems sorted!
Cheers,
FrankG
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30th June 2009, 01:03 AM #62
That's only true if there's no wobble at the back of the chuck.
eg. if the deviation is exactly the same at both ends of the chuck, then the chuck is still running parallel to the axis of rotation, even though it's not central on the axis. So even a foot or two away the blank would have the same deviation.
An unlikely case, but it shows that you can't extrapolate from one set of readings...
Further, if the body of the chuck is running true at both front & back & it's only the jaws that are out, then your blank will spin true. Reverse chucking would be a nightmare though.
- Andy Mc
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30th June 2009, 09:01 AM #63Hewer of wood
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My mind hurts.
Frank, as best I can make it out your figures are right for deviation from the axis but the wobble would be double ie. measured at a bowl rim the range of movement at right angle to the axis.
Still negligible.Cheers, Ern
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30th June 2009, 09:10 AM #64
This is a very real possibility as the jaws are made seperately to the chuck. To achieve the least runout possible the jaws should at least be machined on the chuck they are to be used on, to go to extremes they actually should be machined on the intended lathe to eliminate all possibility of runout. However the reality is with so many "special purpose" jaws available from a multitude of manufacturers plus inserts from just as many manufacturers all with (probably) different tolerences plus the wear on an old chuck..................... I think you can see where I'm going with this, I'd live with 0.005" runout.
To grow old is inevitable.... To grow up is optional
Confidence, the feeling you have before you fully understand the situation.
What could possibly go wrong.
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30th June 2009, 12:06 PM #65
yep...I'm ready to get the duct tape also, all this math is taking it's toll and the mind is glazing over big time.
Keepin' the fingers crossed that Craft Supplies comes thru with a sweet running insert.Cheers,
Ed
Do something that is stupid and fun today, then run like hell !!!
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30th June 2009, 12:13 PM #66
Ed just got off the phone with Adrian at Trend Timbers getting a 1x10 adaptor sent out today may as well try see what happens.
What size is your adaptor insert not sure if you have said or I didn't read the thread of what lathe its on
Adrian mentioned he is only having trouble with certain sizes inserts
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30th June 2009, 12:30 PM #67
Whellin' ...My lathe is a Nova 1500, it has 1 1/4 x 8tpi ...thought buying from Tek that everything would just "snap" into place and run true and fine - NOT .
Cheers,
Ed
Do something that is stupid and fun today, then run like hell !!!
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30th June 2009, 12:48 PM #68
hypothetical
Just a thought and GJ maybe could give some knowledge here
You fit the adaptor nut to the chuck there is a slight play between the threads, you tighten up then tighten the grub screw ..........but in doing so the grub screw is actually putting pressure on one side which is then tilting the nut and chuck to an untrue balance.
forgot to mention also ordered a set of Pin Jaws from Trend also
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30th June 2009, 12:50 PM #69
My SN2 has 2 grub screws, diametrically opposed.
But then again, I bought mine back when Teknatool cared about quality.
- Andy Mc
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30th June 2009, 12:58 PM #70To grow old is inevitable.... To grow up is optional
Confidence, the feeling you have before you fully understand the situation.
What could possibly go wrong.
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30th June 2009, 01:05 PM #71
Ok John
way's of testing I can think of for actual fit is mic both ends of the nut external, mic the internal make sure they are square and not tappered, bearing blue or plastigauge.
Try the fit of a pre-Chinese made nut and check balance of chuck and visa versa
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30th June 2009, 02:03 PM #72Retired
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30th June 2009, 02:59 PM #73Hewer of wood
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I was gunna add some more here but I'm over it
Time to head to the shed and fix boot rocker on my touring skis. New bindings have left the boot heel 30 mm above the plate it should sit on. Wedge shaped shims had to come from Utah with no guarantee they'll be enough. All the key screws were epoxied in and have to be heated to depoxy.
Don't ya just hate Yank QC?
Anyone else had boot rocker?Cheers, Ern
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30th June 2009, 04:55 PM #74
You're gunna need a height gauge and a set of AAA slip_gauges to measure any errors Ern .
To grow old is inevitable.... To grow up is optional
Confidence, the feeling you have before you fully understand the situation.
What could possibly go wrong.
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30th June 2009, 05:11 PM #75Hewer of wood
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Cool.
I could get back to Utah and whinge about their gear being 0.000002 of an inch out!Cheers, Ern
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