Author Topic: Pipe and Bolt Engine Mod-Up (Read 211318 times)

vtsteam · « **Reply #75 on:** January 16, 2015, 06:37:03 PM »

Then I sawed off the excess:

vtsteam · « **Reply #76 on:** January 16, 2015, 06:39:39 PM »

What it looked like:

vtsteam · « **Reply #77 on:** January 16, 2015, 06:42:26 PM »

Turned it upside down in the drill vise, marked out and drilled through w/tapping drill for 4-40 screws.

vtsteam · « **Reply #78 on:** January 16, 2015, 06:44:16 PM »

Then sawed it off to split bearing:

vtsteam · « **Reply #79 on:** January 16, 2015, 06:46:37 PM »

Drilled cap for clearance, countersung, and then tapped one side of the big end. Then replaced the cap, screwed it down and tapped through the other side as a guide:

vtsteam · « **Reply #80 on:** January 16, 2015, 06:50:00 PM »

Drilled for the crank:

vtsteam · « **Reply #81 on:** January 16, 2015, 06:53:34 PM »

And assembled it to the crank. It took a little touch up with a file to remove any sticking points and in a short time it was working nicely. Done for the day,

dsquire · « **Reply #82 on:** January 16, 2015, 08:43:09 PM »

Steve

I see that you have just about got this one nailed.

Cheers

Don

vtsteam · « **Reply #83 on:** January 16, 2015, 09:19:53 PM »

Tacky, Don!

shipto · « **Reply #84 on:** January 17, 2015, 02:13:16 PM »

I too managed a little time in the shed today and made a flywheel. I took some tube and started working it in my circle turner before trimming it down to join the two ends (i really should get my oxygen bottle filled so I can braze its been empty for a while now but anyway) then 3 more bits of tube for the spokes and a bolt and i have a rather bigger than wanted flywheel but the circle turner is meant for flat stock so I was happy it did the job at all.
I could not find a bolt the stated size so I hope it wont be classed as cheating if I use a bit of bar the right size to make up the difference?

vtsteam · « **Reply #85 on:** January 17, 2015, 02:40:42 PM »

Great flywheel!!!!

Quote from: shipto on January 17, 2015, 02:13:16 PM

I could not find a bolt the stated size so I hope it wont be classed as cheating if I use a bit of bar the right size to make up the difference?

Shipto, no problem, I think that was a dumb rule idea anyway. I didn't even use one at all (so far). The idea was really just to try to use pipe for most things, where possible. I should have left it at that. I figured the bolt would just give some solid stock to turn down or use for pistons rods,etc. But the number and size of bolts shouldn't make a difference and a bit of rod the same size, seems like we ought to look the other way.......after all you could have threaded an end and called it one!

I'll figure out how to take the bolt thing out, if nobody has any objections.

ps. I don't qualify for winning this thing -- the main idea was to try to get people working on a roughly similar challenge using their own creativity and havng fun! --- and I am!

vtsteam · « **Reply #86 on:** January 17, 2015, 03:13:05 PM »

I've given in to the fact that I need to sit down at this point and do a simple drawing to figure out how long my connecting rod needs to be to get the piston up to the top of the cylinder.

And where I need to put the wrist pin in the piston.

And how long the piston should be to clear the crank webs.

No more workshop fun today. Sheesh!

Manxmodder · « **Reply #87 on:** January 17, 2015, 03:15:28 PM »

Great start,shipto.

We can accept your bit of bar if you first thread one end and weld a nut on the other end (a fabricated bolt)

Then you can cut the nut and the threaded portion off and we won't call it a bar......OK?

vtsteam · « **Reply #88 on:** January 17, 2015, 03:31:17 PM »

Or just say you did with two fingers crossed behind your back!

bertie_bassett · « **Reply #89 on:** January 17, 2015, 04:31:59 PM »

looks like your all making good progress

afraid ill probably have to sit back and just watch though, iv come to the conclusion I need to strip and clean/rebuild the head of my lathe, its struggling to spin up to speed when cold

also need to clear workshop so I have some useable bench space.

vtsteam · « **Reply #90 on:** January 18, 2015, 06:29:28 PM »

Well Bertie, there will be other mod-ups, and first things first!

After drawing the cylinder and piston out, I could see I'd want more clearance at the top of the cylinder, since I'm thinking about doing this as a uniflow exhaust. So I added a little height to the cylinder (light blue). That means extending it somehow -- or making a head with a recess. Probably do the latter.

vtsteam · « **Reply #91 on:** January 18, 2015, 06:40:04 PM »

This brought up another problem. The top of the cylinder -- the flange-- was just a little too small to put screws in to fasten a head. So I decided to widen it. I cut a thin ring from some 1" pipe and cut out a small section, and sprung it down to fit over the cylinder.

vtsteam · « **Reply #92 on:** January 18, 2015, 06:41:56 PM »

Then I brazed it, and cooled it in wood ashes for a half hour -- don't want to crack it at this stage.

Manxmodder · « **Reply #93 on:** January 18, 2015, 06:42:35 PM »

Make the engine components first,and do the blueprints after

We're a bonkers breed us MadModders

I harvested some of the iron fittings from the lengths of gas pipe last night.
Some up to 2.5" dia,they were a real sod to unscrew due to the amount of hardened jointing compound and hemp around the threads so I ended up having to heat them up with the propane torch to free them.

I got a couple of straight cast iron nipple connectors,one of which looks a candidate for a cylinder.

Probably have to purchase a couple of end caps for head and piston.

I also need to split and flatten some tube tomorrow.......OZ.

vtsteam · « **Reply #94 on:** January 18, 2015, 06:43:58 PM »

And finally cleaned it up:

vtsteam · « **Reply #95 on:** January 18, 2015, 06:45:03 PM »

Ain't it a hoot, OZ?

Manxmodder · « **Reply #96 on:** January 18, 2015, 06:54:44 PM »

That's looking really good Steve,I'd think your design is probably going to be replicated a good number of times in the future for a novelty engine project

I found something else in the scrap pile that also had 'novel engine' written all over it. A hydraulic brake wheel cylinder with a bore of 1.125".

Worth consideration for a future 'bonkers as a box of frogs' engine.......OZ.

vtsteam · « **Reply #97 on:** January 18, 2015, 07:27:19 PM »

Oz I've always wanted to try one of those as a power cylinder for a hot air engine! Future mod-up?

vtsteam · « **Reply #98 on:** January 19, 2015, 05:49:33 PM »

Conrod shortened and brazed to the leftover piece of cast iron to make small end:

vtsteam · « **Reply #99 on:** January 19, 2015, 05:55:28 PM »

And some sawing, filing and drilling later, I have the rod done. I hope it's the right length! As you can tell, no milling cutter was harmed in the construction of this engine.....

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Whose engine in this first ever Mod-Up deserves the coveted Brass Machine trophy!?

Author Topic: Pipe and Bolt Engine Mod-Up (Read 211318 times)