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TEd,
This is a new post to an old question, but I have possibly a better solution to the small area of the vacuum chuck. In the June 2012 issue of the American Woodturner, I have an article on a...

In all of the discussion about setting up rotary vacuum adapters, one important parameter has not be mentioned, the inside diameter of the tubing from the pump up to and through the adapter. The...

I use a thin sticky back craft foam from Hobby Lobby. I have also found that this foam can be used on large chucks by overlapping joints by about 1/32". Large overlaps do not work because they do not...

Hi Gang,
This forum has shown a lot of interest in vacuum chucks over time. I have seen references to my article on vacuum systems in the February, 2011, issue of the American Woodturner. This note...

A couple of thoughts: Venturi style vacuum genrators (not a pump) consume a lot of air. How big is your air compressor and how long will it maintain enough air to hold your turning on the chuck?...

Every time I mount up my vacuum system to use it, the first thing I do is a "pre-op' test as you mentioned. I keed a small aluminum plate handy. 1. I place it on the chuck and apply vacuum and read...

A couple of things to consider here. 1. If you are using the vacuum resevour to float through a power glitch, you need to consider the type of pump you are using. Diaphram and piston pumps have...

I read your post and found it rather interesting. I have a couple of questions and comments. From the photos, it appears that you have a rotary vane oil lubrucated and saled vacuum pump. That type...

[QUOTE=Quinn McCarthy;1848581]I am trying to get my vacuum system working correctly. I have an vacuum leak coming from where the adapter attaches to the chuck. I tried seating it in better with a...

The size of the hose used does matter and it can make a big diffence. If you system is leak free and your turning does not leak air through it then the airflow is small and vacuum drops from chuck...

The usage of a vacuum resevoir has better justification than backup for a power outage.
1. If you place an isolation valve at the manifold seperating the pump and resevouir on one side and the...

For a vacuum chucking system, sizing the pump depends upon what you place between the pump and the vacuum chuck. If you do not have any leaks anywhere, then you can use a small pump. With leakage,...

Be aware that vacuum pumps like to 'drink' any water that is available that will mix with the oil in those pumps that use oil, Robinair, HF, Daton, and others. Oil usually gets milky when it gets...

You can also get vacuum pump oil at NAPA.

The HVAC vacuum pumps I have seen have been rotary vane pumps. The three basic pumps used with vacuum chucking systems in order from highest to lowest max vacuum achievable are: rotary vane, piston...

Be careful. I tried a vacuum pump from HF and was disappointed. The pump pulled a good vacuum and seemed to 'work' OK. The pump was a rotary vane pump that used oil in it. When running, an excessive...

Depending upon your altitude, 19 in Hg is way too low. I am assuming that you mounted the gauge directly to the pump without anything else connected. The 19 in Hg implies leakage around the seals in...

I had a student testing his vacuum system for leaks and needed something to put across the vacuum chuck to seal it off. (I use masonite or sheet aluminum.) He 'borrowed' a saucer from the kitchen and...

Mounting and centering a turning on a vacuum chuck without a reference mark is not that difficult when using the right process.
1. Mount turning on chuck centering it by eye.
2. Bring tool rest up...

1. JT Turning Tools makes one Rotary Vacuum Adapter which is sized for insertion into the outboard end of the spindle using O-rings for sealing. The adapter is sized for the Powermatic 3520 lathe. ...

Bob,
You are correct that the force holding the object on the chuck is the product of the pressure differential times the area. This is a problem for small items and in a few other cases. Since we...