Venturi Vacuum Clamp

thingiverse

This is a vacuum clamp I designed for use with a venturi vacuum device. I use an adjustable pressure control valve to control the input pressure per the vacuum device's specified limits. With a diameter of 2.755 and thus a surface area of (3.14159 * r^2) 5.961 in^2 and a vacuuum pressure of -80 KPa (11.6 lb/in^2), I'm getting around 69 lb of force with this. Which is all to say... this thing really sucks! :-) NOTES: 1) I had to use a clamp to press the o-ring into the groove and then glued it with a rubber cement. 2) I tried this on machined steel surfaces and BCX plywood surfaces and I only noticed about a 2 KPa drop in vacuum (0.29 lb/in^2) or less than 2 lb of force lost. Products I Used (( NO AFFILITIONS / Use anything as good as or better than the ones I listed )) Buna N O-Ring Cord: https://smile.amazon.com/dp/B00QVB4UTO?psc=1&ref=ppx_yo2ov_dt_b_product_details 1/4" OD Check Valve: https://www.amazon.com/DGZZI-Straight-Connect-Reverse-Osmosis/dp/B0855KMH6X Venturi Vacuum Generator: https://smile.amazon.com/dp/B00JR3Y9Q2?psc=1&ref=ppx_yo2ov_dt_b_product_details 1/4" OD Connector: https://www.homedepot.com/p/John-Guest-1-4-in-O-D-x-1-4-in-O-D-NPTF-Polypropylene-Push-to-Connect-Coupling-Fitting-803149/300753474 1/4" OD Elbow: https://www.homedepot.com/p/John-Guest-1-4-in-Push-To-Connect-90-Degree-Polypropylene-Elbow-Fitting-804529/303347813 Vacuum Gauge: https://smile.amazon.com/dp/B084Z344QF?psc=1&ref=ppx_yo2ov_dt_b_product_details WARNING: ANY AND ALL USE OF THIS is completely at your own risk and your sole responsibility! I have NOT tried this with anything more than -11 lb/in^2 and so #1) I don't even know if that's safe and #2) I recommend that you exercise extreme caution with just using this and especially so if you're trying this with any greater vacuum (negative pressure). I make no representation that I know what I'm doing! Any use of this is at your sole risk and your sole responsibility and you accept the full risk of serious bodily harm (to yourslef and others) and any property damage (yours or others).