The Bucket Foundry

[Ocean1]

Wouldn't any moisture boiling off create a new set of imperfections from the vacuum?

Nah, it's not a sealed vessel, the vacuum pump is left on so any gas boiling out is just sucked away.

Is a common problem with most urethanes, they react with any moisture and gas up big time.

I used to have to do it with potable silicones too, the copied mould surface is much better.

[husaberg]

Nah, it's not a sealed vessel, the vacuum pump is left on so any gas boiling out is just sucked away.

Is a common problem with most urethanes, they react with any moisture and gas up big time.

I used to have to do it with potable silicones too, the copied mould surface is much better.

Proper mixing of the parts with a continuous pour and not folding in air helps.
There are plenty of videos on the net on how to make a vacuum pot out of common parts.

[Ocean1]

Proper mixing of the parts with a continuous pour and not folding in air helps.
There are plenty of videos on the net on how to make a vacuum pot out of common parts.

It does. Hard to justify spending a lot for occasional use though.

I may have been personally responsible for ramset NZ changing their policy on free spare static mixer nozzles with every cartridge sold. And if I was doing any great quantity of such work of a paying nature I think I'd be investing in something like this: http://www.contaldi.eu/portfoliotype/indumix-ia/ But even then it's a bit over the top given the small quantities copy moulding small parts typically uses.

[husaberg]

It does. Hard to justify spending a lot for occasional use though.

I may have been personally responsible for ramset NZ changing their policy on free spare static mixer nozzles with every cartridge sold. And if I was doing any great quantity of such work of a paying nature I think I'd be investing in something like this: http://www.contaldi.eu/portfoliotype/indumix-ia/ But even then it's a bit over the top given the small quantities copy moulding small parts typically uses.

Does Mrs Ocean have a pressure cooker?


or even a Jar
you might even already have a vacuum brake bleeder anyway but most house have one of these.

or a bike pump
http://www.instructables.com/id/make...20-by-convert/

[Ocean1]

Does Mrs Ocean have a pressure cooker?
or even a Jar
you mike even already have a vacuum brake bleeder anyway but most house have one of these.
or a bike pump

All good.

But one of the advantages of building stuff for a living is the "spare parts" department that results. And if I need to suck bubbles from resin I think I have one of these somewhere: https://www.piab.com/products/vacuum...andard/mll400/

But given what happened to the last set up I'd probably want a condenser of some sort between the resin and the pump.

[husaberg]

All good.

But one of the advantages of building stuff for a living is the "spare parts" department that results. And if I need to suck bubbles from resin I think I have one of these somewhere: https://www.piab.com/products/vacuum...andard/mll400/

But given what happened to the last set up I'd probably want a condenser of some sort between the resin and the pump.

I'd suggest the same for use of the Mrs's pressure cooker.
As for a pump think rural
I see they use Kevlar vanes now.
http://hambydairysupply.com/xcart/pr...roductid=17813

[WilDun]

As for a pump think rural
I see they use Kevlar vanes now.

Husa, - The good old milking machine pump! - Is that a giant pine cone in the background or a monster truck wheel?

Flettner,
When you say that there is only air going in at BDC I'm assuming that the fuel injection only takes place well into the upstroke, to prevent too much mixture disappearing out the exhaust?
Will that give it enough time to produce a well and truly hot homogenised mixture?(assuming that these are requirements for HCCI).

Have you got around the short rod thing? (Ryger shortcoming) - If you are using the new straight line approach with your geared crank arrangement, did you find a suitable seal for the piston rod?

[WilDun]

....... the epicycloid crank to run under this cylinder, so tight crank case pumping and oil sealed off in the bottom end.
The idea for this engine is to regulate it via exhaust throttle and fueling, with the inlet being open, the inlet being the three radial ports at 120 degrees in between the exhausts. These straight in to the cylinder transfers also feed the crank case via piston port at TDC. There will be three pulsed injectors in these three ports but only supplying fuel when the crank case is drawing air. Flow into the cylinder at BDC will be air only.

Not really sure what you mean by "crank case pumping" and "cylinder transfers" - forgive me if I'm a little slow, but as I understood it, the crankcase is completely sealed off from the cylinder
I never did see properly how the Ryger stuff actually worked, I had a lot of other serious crap going on the earlier part of the year, so there is a bit of a gap there!

[Flettner]

Not really sure what you mean by "crank case pumping" and "cylinder transfers" - forgive me if I'm a little slow, but as I understood it, the crankcase is completely sealed off from the cylinder
I never did see properly how the Ryger stuff actually worked, I had a lot of other serious crap going on the earlier part of the year, so there is a bit of a gap there!

Sorry, by high pressure crank case I do mean under piston. Crank case proper is sealed off and oil feed. I'm not sure about the bushing guide bearing, with the rod being hard anodized 7075. Do I make the bushing hardened and ground steel or carbon? This bushing will be oil feed.

[WilDun]

Sorry, by high pressure crank case I do mean under piston. Crank case proper is sealed off and oil feed. I'm not sure about the bushing guide bearing, with the rod being hard anodized 7075. Do I make the bushing hardened and ground steel or carbon? This bushing will be oil feed.

Yes I figured that's what you were probably describing, - I'm not much of an expert of course, but carbon seems good to me as there will be no thrust forces (side loads) on it and it's self lubricating qualities will prevent seizure, which would most certainly happen with hardened steel, ie. if the clearance was to change!

[Flettner]

With this HCCI the piston can now be ceramic, a heated piston might be a good thing (and head), how do you work with ceramic? This ceramic in my hip is some sort of ceramic matrix being a little bit flexible, so I'm told and light weight.

[Grumph]

Sorry, by high pressure crank case I do mean under piston. Crank case proper is sealed off and oil feed. I'm not sure about the bushing guide bearing, with the rod being hard anodized 7075. Do I make the bushing hardened and ground steel or carbon? This bushing will be oil feed.

With this HCCI the piston can now be ceramic, a heated piston might be a good thing (and head), how do you work with ceramic? This ceramic in my hip is some sort of ceramic matrix being a little bit flexible, so I'm told and light weight.

According to some reports i remember, the bush material may have been one of the Ryger problems...Is it to be a split bush to assemble around a piston/rod stem ? Personally I'm a traditionalist, I'd look at cast iron, nicely honed. Needs very little lube. Takes heat well.

Why ceramic ? If it is to have an extension, how strong will it be ? How much of a blending radius would it need ? Weight Vs an alloy one....

[ken seeber]

Yeah, I know it’s been a while. Been a tad distracted with other stuff and also getting on top of a myriad of little tech issues. Excuses done with, it’s getting close. So, rather than happy snaps, did a movie. Produced, directed, scripted, acted & edited by yours truly.
Yeah, I know, again; “Don’t give up your day job”. However, with Fletto “champing at the bit” (sorry Husa, not Pharlap this time ), I thought it time to get a move on. So, here you go:
https://youtu.be/Hodd8oyiawk
All going well, should be able to get the thing running next week. No dyno load stuff, just free running and to see if it makes some noise & smoke = good old pollution.
Watch this space.

Also on this vacuum degassing stuff, we just got the compressor out of a dumped fridge. They are great vacuum pumps. Squirt a bit of oil into the intake every now and then. In our case, we used it to degas a small crucible with molten metal. We sat the crucible in a firebrick which was sitting on a rubber mat. Then we used a cut-off fire extinguisher body that sat over it all and sealed on the rubber mat. We also used it to degas some polyurethane mix prior to pouring. Next time, I'll fit a small window so we can see the rate of gas removal.

[gamma500]

Looking great Ken!

Will be interesting to see it running, you guys are so ingenious.

[WilDun]

Yeah, I know it’s been a while. Been a tad distracted with other stuff and also getting on top of a myriad of little tech issues.........Watch this space.

Ken,
Great movie! - which one is you?
Look forward to hearing and seeing your machine in action!

Flettner
How about a carbon fibre cord used as loose gland packing? - just semi joking!