Great Dane excavating co.

[9W Monighan]

Try some 12L14 "Leadloy" free machining steel if you want machinability.

[ihbuilder]

I have no problem on 316 . But then again you need your S&F's right . Oh your doin this manually Looks good so far .

[Cooper]

Yeah, all hand crankin!! Problem I have with my skills, tooling, small machines is trying to machine the inner dimensions and being 3" deep. That's why I was using tubing and making the tops/Pistons separate then soldering/brazing them in. Then going back and final machining to size. I have to make some small inside groove cutters. Only have one that I've made and it took me a bit of time grinding that one. Always seems like I spend way more time making the tooling than parts!!! Lol! Guess that how it always is!!

[bigford]

by the time RW is done with this piston he could have bought 2 scaleart 5 stages
LOL!!!!!!

[Cooper]

Haha ! Just remember that if I see you next weekend!!! Lol!!! I'm just happy I can finally make something! Even if it doesn't work!!!

[bigford]

ya working with a busted wing is rough!!

[JAMMER]

Hi Cooper one thing when you polish the cylinders you do not want a high polish you need something that will grab the oil so you want smooth not polished.

[ihbuilder]

ID grooving, I found them on McMaster . Oring groovers and snap ring groovers . You have to take them slow and a very good sense of touch , they break easy . Always use tube for your barrels. Manual or cnc , you should be able to do stainless . You could chrome your barrels .

[Cooper]

[Cooper]

Well I got it working,,,, problem I encountered on final polishing and installing new orings was on the outter most cylinder the groove I cut for inner seal let loose. The way I did it was to use tube and soldered onto end a piece smaller diameter that I could cut the groove inside. Problem was when I soldered it the solder did not penetrate the whole piece. The grove was cut just a bit into the tube so without the solder wicking the entire piece the small ring is now loose. Now I've got to take all apart again solder it in place, re grove without de soldering end. Ahh the wonderful work of not doing it right the first time!!! I think what I did wrong was had tolerance too tight and that did not allow addiquate wicking of solder on entire surface. Sooner or later(apparently later) I'll get this working. And I also realized I need to rig up a pump and tank to use as a test machine. Slowly getting there.

And thanks for the input on # of stainless and McMaster grooving tools, I don't know how I missed them on that site!!

[bigford]

we'll have to talk next weekend

[Cooper]

http://youtu.be/8JNPGro3SZs

Just the prototype of a telescopic cylinder. Now I know I can make them, so,e modifications in place but the simple concept works

[bigford]

3 more stages!!!

[RCP57]

Awesome stuff RW!

[Cooper]

Mark, I don't know how big a six stage cylinder would be with materials I'm using!!! 1/4" increments on tubes,,, a lot smaller cross section orings and it would work. Ones I'm using are 1/16". Need at least 1/32 for more stages.

Reg, they are actually pretty simple and easy now that I know what to do. I'll post up some pics of how I actually made it

[Cooper]

They are the three sizes of tube I used. And in the one pic I have a scribe pointing to the holes in tubes that allow oil to enter into on the downward stroke and oil to exit on the upward stroke. The smaller piston has two orings but doesn't need two. When I made it first I was using it as a guide. Well a mess up really. I just soldered bigger solid caps onto tubs, then machined the hole and inner oring grove. That way I never had to worry about messing up inner parts of tubes. Polished them before soldering/ and again after. I want to make them out of steel or stainless for project on dumper. Just don't know how easy that will be for me to work. I'm usually just brass and aluminum.

[JAMMER]

Cooper you can buy telescoping tubing I got some at Cabin Fever. It can be had in steel or stainless. Hobby Metal Kits is the place and it is thin wall. www.hobbymetalkits.com 608-345-2617 Bernie is great to deal with. I got steel in 1/16 graduations for 6 stages. Happy building. Ed

[ihbuilder]

304 stainless

[Cooper]

Thanks, that's what I need to get and make a prototype in stainless.

Some work/play today

http://youtu.be/AH3yVILDwtw







This was a project my dad wanted me to get done for him while he is in sunny Florida. It is the sump drain from house basement. Last year critters and leaves clogged end up and froze solid 3-4' length. So I replace the last 15' and put a cleanout in it. Wasn't really necessary but I didn't have and couplings for dwv pipe only tees and an end cap. But now if something cloges end I can push it out. And also had something to dig up and push dirt around . Contract job, I will have to bill him. But he only pays in 1:14 scale!!!!

[Old Guy]

Cooper

Used to work in a machine shop building 3 stage dump cylinders, what we built had the oil enter the bottom of the cylinder. The bottom looked just like yours except it had a port, no port at top. we then welded a heavier flange on the bottom of the second and third stage in which we machined the seal groove. For the top of first stage we did same as you, we did internal thread for the other 2, know you can't do this so just repeat what you did on #1 stage, no seals just make sure that the inside of caps are smooth. Double O rings on bottom are fine gives a better seal. My model 300 ton has this type of cylinder works great, and 1/16" size difference is fine even for tops work fine as seals are inside of piston, and no seal at top allows air to flow out through heads.

Earl