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Vaccuum Pump Check Valve
Off today to the Mens Shed Router with a small vacuum table, 84x84 mm.
Plan is to hold blank 3 mm MDF 90x90 mm stock and reduce it down to 86x86 with R12 corners.
Problem is, the vacuum pumps I purchased off ebay (Chinese cheap) need a check valve to operate.
So today's trial will have to rely on the dust vacuum cleaner.
Anyone got a simple design or suggested source for a suitable check valve ?
If the trial is a success, I will report with photo, details and a glowing description.
John.
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1 Attachment(s)
The trial at the shed was a success. :U
The dust vacuum cleaner supplied the vacuum, and we didn't run it long enough to overheat.
The vacuum table is 9 mm polycarbonate screwed to 1.6 mm aluminium plate with 4 mm diameter ball nosed cutter grooves and a turned brass hose fitting glued in with epoxy.
Cutter was 2 mm diameter single flute at 12,000 RPM, cut 0.4 mm with feed 200 mm/min cutting clockwise (climbing).
No sign of blank moving on the table.
Photo shows the table and a typical end result after the engraving steps.
Attachment 365168
John
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You get similar check valves in compressors. They are nothing more than a very flat smooth bit of steel sitting inside a shallow cavity over the top of a hole underneath.
A check valve on my compressor died. No air. Disassembly showed that the flat bit of metal had cracked in half. Dear me. I removed one blade from an old feeler gauge, polished one side on 2400 W&D, cut it to shape, and reassembled. It runs very nicely.
Truth be told, any solid bit of good shim might do.
Cheers
Roger
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Thanks Roger, my investigations has produced very similar for vacuum.
Thin plastic/rubber material in a disc with a centre fixing to a metal disc with 4 holes.
John