Cautions!! While turning under vacuum

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2 Disclaimers We are not experts We have done the research and put together a few systems and finished many bowl bottoms We are open to any suggestions, comments, or questions (write them on the back of a $20.00 bill and submit them) We don t have all the answers: But these systems work and are much cheaper!

3 Cautions!! While turning under vacuum Don t turn through your work A severe catch while turning can cause a serious problem Soft or punque wood may not hold vacuum pressure Thin walls can collapse under vacuum pressure Porous wood grain can allow air to be drawn in (Oak) A power disruption of the vacuum pump while lathe is running is dangerous - or turning the pump off before stopping the lathe (For additional info ask Pete!) Turn at a lower than normal speed

4 Vacuum Chuck Systems Built Jet Mini Jet 1642 Powermatic 3520A Powermatic 3520B Powermatic 4224

5 Vacuum Systems Currently Available Through Retail Outlets Gast Vacuum Pump $ to $ Vacuum Rotary Adapter $55.00 to $ Gauge Kit $85.00 to $ /2 Vacuum Cylinders (Aluminum) $70.00 to $75.00 Total $ to $ Plus the addition of hoses, fittings and filters

6 Complete Vacuum Generator Systems Available Through Retail $ to $ And these do not include the air compressor that is required to run them!

7 The Bruised Brothers System Vacuum Pump (Used) $35 to $75 Lamp Rod $6 to $10 Bearing $5 to $12 Vacuum Gauge $10 to $20 Vacuum Valves (2 ea) $14 to $20 Filter $15 to $20 $5 to $10 $25 to $40 $115 to $215 Vacuum Hose Miscellaneous Hardware Total

8 Sample Vacuum Chuck Parts List Item Description/Location Quantity Price Total $ 1 Vacuum Pump 2.65 CFM from Plccenter.com 1 $60.00 $ Vacuum Gauge Surplus Center # $5.95 $ Vacuum Valve Veneer Supplies.com 2 $6.55 $ Exhaust Muffler Veneer Supplies.com 1 $2.75 $ High-flow Filter Veneer Supplies.com 1 $14.95 $ Street Elbow Veneer Supplies.com 2 $1.80 $ " brass Pipe Veneer Supplies.com 1 $0.92 $ Brass Cross Veneer Supplies.com 1 $3.75 $ Pipe Union Lowe's 2 $1.14 $ Brass Barb 1/4 Male Veneer Supplies.com to 3/8 Barb 2 $1.55 $ Brass Coupling Veneer Supplies.com 1 $1.15 $ Lock-on Connector Veneer Supplies.com 1 $12.75 $12.75 ** 13 Lock-on Fitting Veneer Supplies.com 1 $4.85 $4.85 ** 14 Vacuum Hose 3/8" ID - Lowe's by the Ft. 10 $0.60 $ Bearing 1621 DCTN Double sealed - Purvis 1 $13.23 $13.23 * 16 Lamp Rod 4' with hardware Lowe's 1 $6.75 $6.75 $17.00 $ $ Total ** Not including Tax and shipping ** Shipping estimate * Look for less expensive Bearings - ebay for example ** These parts are optional but make a convenient connection

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11 File threads on one end of brass fitting to just fit into bearing

12 Epoxy in fitting to Bearing

13 Parts required for assembly

14 Building a bearing adaptor For a vacuum Chuck system by The Bruised Brothers 1 3/8" 0 5/8" 1 1/2" 1 1/4" 0 25/64" 0 3/4" 1 1/2" Material: Use good tight grain hard wood - (Maple) 2 1/2"

15 Lock 2 nuts together on lamp rod and epoxy into adapter

16 Complete bearing adapter

17 #2 Morse Taper to fit head stock

18 Completed headstock assembly for a Jet Mini lathe

19 Headstock assembly with on/off valve

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21 Another assembly option Note Bleeder Valve Photo from veneersupplies.com Used with permission

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23 Selecting a Vacuum Pump Types of Pumps Diaphragm Pumps Piston Pumps Rotary Vane Pumps Oil Bath Pumps Refrigerant Pumps Venturi Pumps Vacuum Cleaner

24 Diaphragm Pumps Ideal for vacuum systems Often used in Vacuum clamping Fairly low CFM ratings 1 to 3 CFM Typical Very reliable Can be purchased used at relative low cost

25 Diaphragm Pump 1.9 CFM

26 Piston Pump Not as quiet as diaphragm pumps Common in vacuum clamping Higher CFM output 2 to 5 CFM Typical With Piston Pumps use a liquid filled gauge

27 Piston Pump 5.5 CFM

28 Piston Pump 1.75 CFM 29 Hg

29 Rotary Vane Pump Found in most woodturning catalogs Generally maintenance free Good CFM Rating 2 to 10 Typical Will run a long time Tend to get hot with extended usage

30 Rotary Vane Pump 2.6 CFM

31 Rotary Vane Pump 220 Volt 4.5 CFM

32 Oil Bath Pump Used by the air conditioning industry Can emit a light plume of oil with extended usage CFM range from 2 to 6 CFM typical Designed to pull moisture out of AC units Need to keep lubricated with fresh oil

33 Refrigerator Pump Very Quiet Very low CFM less than 1 Large and bulky Hard to make connections Need to watch for Freon in the system Uses oil to keep cool

34 Venturi Pumps Some are very low cost Needs a compressor to operate Time consuming to hook up Dependent upon compressor size Not very portable because of the compressor Needs about psi from compressor

35 Vacuum Cleaner Not Recommended Not designed to run with air flow blockage Expensive High CFM but low Vacuum Hg Was only able to pull about 6 or 7 Hg Hard to adapt to the lathe

36 Vacuum Pressure Guide Bowl Diameter Inch Pounds of Pressure Inch Inch Inch Inch 12 Inch Inch Inches of Mercury P=πr²*.491*Hg (1 in. Hg = psi at sea level) 30

37 Vacuum Pressure Guide Contact Diameter in inches Vacuum HG Pounds of Pressure

38 Easy to make PVC Chucks

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41 22 inches of Hg 2 inch in Diameter How much Pressure is holding the ball?

42 Other uses for vacuum

43 A few things we have learned

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