Question on my separator build.

[NLAlston]

A little while back I completed my first separator build.  I simplified things a bit, on this first build, opting for the basic plywood lid type, with baffle.  I was surprised to find that it worked as well as it did, and am looking forward to constructing a larger, more elaborate setup for my DC (my present one is for my Shop vac).

However, when this thing is in its operational stage, it emits a loud, continuous, bloodcurdling high pitched squeal.  It is deafening, and unbearable to leave running - even with hearing protectors on.
The inlet hose is of smaller diameter than the outlet hose, and I wonder if that might be the cause. 

I used 2" PVC fittings

[phil (admin)]

Not sure, maybe it is the air howling through the 1-1/2" hose?  Can you disconnect that?

Mine don't make any objectionable noises.

[alan m]

I haven't found any funny noises from any of the ones iv made. (although they are all top hat designs)
I would put the noise down to the small diameter of the pipes

[Schreck]

Could be the hose itself.  Some hoses that look like vacuum hoses but are intended for water (swimming pool filters, sump pump discharge, etc.) really scream when attached to a vacuum cleaner.

[stan]

Has anyone modified the 32 gal separator lids as sold by Rockler / Woodcraft to include the Thien designed baffle system?  I'd like info. if anyone has done this. 

[NLAlston]

It seems that the smaller (suctioning) hose was the culprit.  My other hose was 1-1/2", and I just recently picked up  another - same type, and diameter- hose to outfit my separator with.  Everything is now fine, within that horrible squealing  :D. 

Thanks to all for responding.

[DennisCA]

I've seen that you could run a screwdriver or similar along the hose with some pressure, to change the material shape a bit, that should make it less perfectly repeating and thus remove the annoying sounds. I dunno if it was Jay Bates who did that...