I have the middle size West pump. It dispenses about 1 oz of resin+hardner per stroke and is fine up to about a pint. For larger volumes (sometimes a gallon or two in a batch) I pour the resin into a pail and use a standard graduated paint rule. The paint rule has scales for 2:1, 3:1 and 5:1 so I can use it for other epoxies. I use the cheaper 2:1 stuff for non-structural filling and ProSet is 3:1.

--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com

"Jim Conlin" wrote in message ...
Measuring epoxy is a pain. The mustard pumps are fine if you need 1 to 8 oz. (30 ml. to 200 ml.), but if you need a quart, they're a PITA.
Weighing is hard to do with the level of repeatable precision that i'd like. There's no practical and reliable way to precisely measure a small (5ml.) batch.
There are also commercial epoxy measuring pumps, the "Sticky Stuff Dispenser" and "Goo Grinder" from These folks which look like a good start, but seem overpriced to me. I'm envisioning perhaps a pair of gear pumps, geared tpogether at 5:1 or whatever. They could be operated by a hand crank or spun with something powered.

So, my question is this- Who can recommend a positive displacement rotary pump that is inexpensive and will tolerate the nasty chemicals of epoxy, hardeners and solvents?

Subject

I buy epoxy resin in 500 lb drums (55 Gal) and hardner in 40 lb pails (5
gal).

I mix this 5:1 by weight, 4:1 by volume.

Designed and built a resin pumpng system consisting of a pair of 1/2"
NPT Oberdorfer bronze gear pumps that are coupled together in the proper
ratio by chain and sprockets.

The entire thing is then powered with a 1/2HP motor controlled by a foot
switch. driving a 7:1 belt reduction set of sheaves.

Use a drum heater in the winter to keep the resin viscosity under control.

Typical batch is about 1.5-2 quarts at a time.

Use a Jiffy mixer, powered by a drill motor, controlled by another foot
switch to do the mixing.

It has worked well for years now.

Lew

Can you recommend a source for the pumps?

"Lew Hodgett" wrote in message
ink.net...
Subject

I buy epoxy resin in 500 lb drums (55 Gal) and hardner in 40 lb pails (5
gal).

I mix this 5:1 by weight, 4:1 by volume.

Designed and built a resin pumpng system consisting of a pair of 1/2"
NPT Oberdorfer bronze gear pumps that are coupled together in the proper
ratio by chain and sprockets.

The entire thing is then powered with a 1/2HP motor controlled by a foot
switch. driving a 7:1 belt reduction set of sheaves.

Use a drum heater in the winter to keep the resin viscosity under control.

Typical batch is about 1.5-2 quarts at a time.

Use a Jiffy mixer, powered by a drill motor, controlled by another foot
switch to do the mixing.

It has worked well for years now.

Lew

An Update:


Snip

Use a Jiffy mixer, powered by a drill motor, controlled by another foot
switch to do the mixing.


Sooner or later it is time to clean the Jiffy Mixer.

Since it is S/S, a 2,800F propane flame does a great job of burning off
the hardened epoxy with out harming the S/S mixer.

Don't try this on plain carbon steel mixers.

Lew