Composite block 3 x 3 x 1 1/2" Tapped 1" x 8 TPI or 1 1/4" x 8 TPI with instructions to mate to wood block. This is the material used in my finished cups. 1/3 cost of face plates. $11.00 each.
Note: Free shipping if ordered with bearing/cup offer above, I will send shipping invoice if ordered separately.
Notice: Out of stock on composite material until early April.
Contact me and I will share information/instructions on making your own tapped blocks.
Finished VACUUM CHUCK:
4" OD PVC vacuum chuck
with 1 1/4" x8, 1"x8
or M33 x 3.5 threads, premium sealed bearing, 3/8"OD polyethylene tubing through the headstock. $65 inc $10 shipping.
* 4”OD (sold as a 3” Schedule 40 Coupler) is supplied as part of Super Frugal II kit and part of “Finished Cup with Threads”.
XX Generally supplied with kit; “2 encapsulated bearings, extension tubes, 2 PVC cups”.
Kit also available as; “3 encapsulated bearings, extension tubes”.
Important: on the checkout page, please list phone # and verify the email address listed is correct and currently monitored (including spam filter).
Note: Laguna lathe needs a longer tube please email me.
Clarifying: PayPal is my shopping cart and invoicing agent, upon checkout you do not need a PayPal account, you can pay with any CC or other means.
Many sizes available email
Special 'don't pass up this offer'
2 motor grade sealed bearings, encapsulated with extension tubes, & detailed illustrated instructions. This will enable you to make additional sized cups. 2" & 3" PVC cup included. Total $28.00 w/shipping
Just need the bearings, don't need the PVC cups?
3 bearings, encapsulated with extension tubes, illustrated instructions. Total $25.00 w/shipping
Explore your local building center, hardware store. PVC shown is for reference only, not for sale by (Frugal). Except for a few popular sizes in kits and finished cups.
With an extra set of bearings there is a cornucopia of options available. Dimensions shown are outside to the closest 1/8”. Hint take your ruler when shopping, PVC is sold referencing the inside dimension of the tube inserted into the coupling.
Caution when going from the very largest to smallest, the amount of pressure varies greatly across the face of contact with workpiece.
The area of a circle is pi times the radius squared (A = π r²). Example: 4” diameter coupler,
(π) 3.14 x (r²) 2x2 = 12.56 SqIn
12.56 x 12 pounds per square inch
=roughly 150# pressing against your work piece. My arbitrary figure of 12#/SqIn is roughly 80% of atmospheric pressure at sea level.
Doing the math the 6.75 diameter = 430# pressure (enough to implode a thin wall workpiece), conversely the 1 7/8” piece has a holding power of 33# (very, very light touch with your turning tool). Use your ball valve to modulate vacuum.
Need more pieces to complete your hookup? Quality parts.
0 to -30"Hg vacuum gauge; Brass SS ball valve; 5 Black HDPE tees & male/female connectors; in-line filter; 5' vacuum tubing; clamps, screws pictured. Mounting board not included. Seem like a lot of money? Try to buy all the parts above for less. $45.00
The secret and basis of my vacuum chucks: The premium sealed encapsulated bearing is in the vacuum chuck. Vacuum from its source is carried through the headstock with polyethylene tubing eliminating the need for expensive outboard adapters and the potential of headstock leaks. The 3/8" OD polyethylene tubing can be connected to virtually any vacuum source. IE; 3/8" ID flexible tubing, in most cases without clamps or connectors. Kits below include easy illustrated instructions. Questions? Click here.