Crossette Pumps!

[TheArchitect23]

Im thinking of machining a few crossette pumps, inspired by Viking's rockets i think small pumps would be useful.

Maybe 3/8 1/2 and 5/8 3/4?

 

Would these sizes be to small? as each would be devided into 4 as the break shatters them, they should be smaller - thus burn faster. 1'' = 4X 1/4 stars = 100 ft break is no issue?

 

Thinking along the lines of cake inserts, 2'' shells, and rocket headings.

 

 

 

Anyone out there have a pump in the smaller range, and some calipers to messure the dimentions?

im looking for the dimentions of the cross in proportion to the shaft size in the sleve.

 

* google search works better than the forum search, again. mumbles has posted dimentions for a 3/4 pump i will try tonight.

apparently the pin thickness and length if for fuse. learn something everyday. lol

Edited June 1, 2013 by TheArchitect23

[Mumbles]

Glad you found the dimensions. The general ratios are more or less constant. The bigger commercial tooling sets seem to get a little smaller on the ratio with increasing size. The tooling itself is not terribly critical, it's just a matter of making what you have work. I will say that the smaller the crossette, the harder they are to make work properly.

[TheArchitect23]

well, i tried a demo pump today.

not to focused on the dimentions. they are 15% smaller than the post i found by mumbles.

I then realized i had the cross pattern backwards

but thats okay, i can easily trim it back up. curious if it would work well for slower comps?

 

the plunger is slightly to short, i know. and the dimple is from the hold down on the mill.

 

I didnt do any polishing, other than that, any criticism + feedback welcomed. i'll do a test pump on some leftover Pearl formula when the suns up.

Edited June 4, 2013 by TheArchitect23