CHUCK fitting issue

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i bought a 1 1/2 8 plate for my lathe but it is very loose..i am wondering if i received a 39mm -4...

would they both screw on or would one not fit the other at all?
 
A back plate should be a farley loose fit on the spindle so it can register on the shoulder of the spindle.
 
It's loose allright . i have 50 wraps of silicone tape and it still moves around as i'm turning ..either the plate is machined too big or something
 
Sounds like you should send that plate back if you just purchased it.
For it to be a slight bit loose as your screwing it on would be normal, but
What your saying, it way too loose. If it was slightly tight, then it would be different,
and you may be able to fix it. I would return the plate or purchase another in the case you cant return it.
 
Mesure the ID of the BP and the od of the spindle. whrer did you get it from.
 
I will as soon as they get more in..pita till then...i'm mainly just wanting to know if a 39mm-4 fits on a 1/2-8 tpi
 
the spindle is 1 1/2....just trying to figure out if they sent wrong one or if it is just oversized..

i just don't have a 39mm to compare with

- - - Updated - - -

shars
 
the ID of the threads on my back plates are 1.348 to 1.355
 
i got 1.500 on spindle

plate is 1.515
 
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