Chuck---Its good to see someone who solders like I do!!! ;D ;D What gear cutters do you have? A complete set or------
Inverted Hit n Miss Engine, Compressed Air
- Thread starter cfellows
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Brian Rupnow said:
Hey Brian... These are cut with 24 pitch involute gear cutters. I think I lack 1 or 2 from having a complete set of 24 pitch. I've bought them 1 at a time as I needed them. Expensive buggers!
Chuck
maverick
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Chuck- What material did you make the cam from? Will it be hardened? Just wondered if the follower will
round over the edge or if that will even matter.
Mike
round over the edge or if that will even matter.
Mike
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maverick said:
The cam is made from 12L14. I don't think round over will be a problem. Since it's a hit n miss engine, the cam follower will only be on the cam about 10% of the time.
Chuck
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Managed to get a few more things done. The governor is patterned after the one Phil Duclos used on his Victorian engine. I made the 5/8" brass balls using an over-the-top ball turner that I had made several years ago. Before I could use it however, I had to adapt it to my QCTP. I used the boring bar holder and inserted a 3/4" brass bar that I had bored out to 1/2" to accommodate the 1/2" shaft of the ball turner. The small protrusions on one end of each ball will be turned off and bored to accept the swing arms of the governor.
I also made the piston and the connecting rod. The latter is made from 3/8" thick x 3/4" wide aluminum. Finally, I also finished the crank disk but still have to make the crank pin.
And, here's a couple of images with a few of the parts loosely hanging in place
Chuck
I also made the piston and the connecting rod. The latter is made from 3/8" thick x 3/4" wide aluminum. Finally, I also finished the crank disk but still have to make the crank pin.
And, here's a couple of images with a few of the parts loosely hanging in place
Chuck
Did you cut the gears? If so, they look great.
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Thanks, Brock,
Well, I think I'm within a day or two of having this thing ready for a test run. It will take a little longer to get the governor bits all hooked up so it runs in hit n miss mode, but I should have all that part finished as well in less than a week, maybe by the weekend sometime. I'm really pleased with the way everything is turning out. I think this will be a nice looking and good running engine.
Got to get it finished, I'm already thinking about my next project.
Chuck
Well, I think I'm within a day or two of having this thing ready for a test run. It will take a little longer to get the governor bits all hooked up so it runs in hit n miss mode, but I should have all that part finished as well in less than a week, maybe by the weekend sometime. I'm really pleased with the way everything is turning out. I think this will be a nice looking and good running engine.
Got to get it finished, I'm already thinking about my next project.
Chuck
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Thanks, Bob.
I got the engine running last night and made a number of improvements and tuneups today. Once I got it all together, there were several embarrassing problems that I had to correct.
- The connecting rod was too long so the piston was hitting the head before top dead center. Had to mill a depression in the head and face a 1/16" off the top of the piston.
- The connecting rod was hitting the side of the cylinder so I had to turn a bevel on the inside of the cylinder and turn the rod down to a smaller diameter.
- The valve travel was insufficient to open the valve, so I had to do some more machining on the cam. Also had to increase the dwell since the valve wasn't staying open long enough.
Today I corrected all that. I also added the plumbing to bring the air supply line out the side of the base. Now all I have left is to complete the governor and valve latching mechanism so it will run in hit n miss mode.
Got a video loading on youtube at the moment.
I will post the video as soon as it finishes uploading. Here are some pictures.
Chuck
I got the engine running last night and made a number of improvements and tuneups today. Once I got it all together, there were several embarrassing problems that I had to correct.
- The connecting rod was too long so the piston was hitting the head before top dead center. Had to mill a depression in the head and face a 1/16" off the top of the piston.
- The connecting rod was hitting the side of the cylinder so I had to turn a bevel on the inside of the cylinder and turn the rod down to a smaller diameter.
- The valve travel was insufficient to open the valve, so I had to do some more machining on the cam. Also had to increase the dwell since the valve wasn't staying open long enough.
Today I corrected all that. I also added the plumbing to bring the air supply line out the side of the base. Now all I have left is to complete the governor and valve latching mechanism so it will run in hit n miss mode.
Got a video loading on youtube at the moment.
I will post the video as soon as it finishes uploading. Here are some pictures.
Chuck
arnoldb
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:bow: :bow: Very well done indeed Chuck :bow: :bow:
She runs like a champ - and that sharp exhaust note is really really nice!
I'm sure this engine will be even more of a winner in hit 'n miss mode Thm:
Pity it's Winter here in Namibia and my day job and the unusual cold are interfering with shop time...
Kind regards, Arnold
She runs like a champ - and that sharp exhaust note is really really nice!
I'm sure this engine will be even more of a winner in hit 'n miss mode Thm:
Pity it's Winter here in Namibia and my day job and the unusual cold are interfering with shop time...
Kind regards, Arnold
Well it's offical Chuck!!! You da man!!
Amazing stuff, Chuck. You get KARMA for this one!!!---Brian
