Heat the PVC to about 212 deg, in boiling water. knurl the brass part, the
press them together, should hold tight. but I suggest that what ever you do,
make some samples first. If heated you might be able to get away without
machining the PVC, save time and money.
gary


"Rob" wrote in message
...
I'm pressing a cylindrical brass part into a turned PVC part. The Brass
component is 24mm OD and is pressed about 10mm into the PVC until a
shoulder
on the brass part is reached.

Is there rules of thumb for the amount of interference used? I've been
boring the PVC to 23.75mm (diameter is 0.25mm smaller than the inserted
brass part. The OD of the PVC part is 40mm

It seems to work ok but I don't know if I could get away with more
interference (read less accurate machining!) or will this lead to the PVC
failing and cracking with time.

Once assembled there will be no significant loads between the two parts.
The
PVC is just a cover for an electronic sensor that mounts on the end of the
brass part.

Would it be better to have a loose sliding fit and use some sort of
adhesive
/ rtv to assemble the parts?

Any advice welcome.


-- |-----------------------
| | PVC 23.75mm ID
------ |-----------------------
\
BRASS |
24mm OD |
3mm wall|
/
-----
| |----------------------
-- |PVC OD = 40mm
|----------------------
|10mm|


regards
rob