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Huff and Puff (Tiny)
« on: Today at 12:17:54 AM »
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Gentlemen,
While I was waiting for aluminum to be delivered I needed something to keep my hands occupied. When the thread about the Huff and Puff steam engine was started by Doc I went to the link to have a look at the original that Phillip Duclos created. I took all the dimensions and as has become my habit I scaled them down to 3/4 of the actual dimensions. That gave a bore and stroke of .1875 x .094. The small hex bolts that hold the front head and the cylinder to the base are M1.0 x .25 and the bolts that connect the rod and valve strap are M.08 x .20 (.032 diameter) The base is .785 long and overall it's 1.25 long.
I built everything to the drawings and it would barely run so I had a look at the valve and changed the timing on it. [ Guests cannot view attachments ] [ Guests cannot view attachments ] [ Guests cannot view attachments ] [ Guests cannot view attachments ] [ Guests cannot view attachments ] [ Guests cannot view attachments ] [ Guests cannot view attachments ] [ Guests cannot view attachments ] [ Guests cannot view attachments ] [ Guests cannot view attachments ] [ Guests cannot view attachments ] [ Guests cannot view attachments ] [ Guests cannot view attachments ] [ Guests cannot view attachments ]
It will run by breath but just barely although I had it well oiled for running on the video.
gbritnell
Wow George you certainly have a flair for the miniature stuff!, one of those would sit very well among my other tiny engines.
That is fantastic really wish i could make something like that just hard to believe excellent
Saw it running on YouTube, Nice!
Len.
This is Awesome!
Couldn´t word it better, what an amazing job you did there
I made the horizontal so that just begged for a vertical. The same dimensions for all the parts except the base, lower cylinder head and uprights. The uprights are threaded M1.2 x .25 at the top and tapped the same size at the bottom. They are held from underneath by screws.
What I'd like to know is where in the heck did you find such a large penny?!?! ;c)
The upright engine looks very scale. Where is the exhaust, through the piston valve?
Yes, there is a center groove for the intake that aligns with one or the other of the ports. At the ends there is a flat that uncovers the opposite port for the exhaust cycle.
gbritnell
Awesome George.
Gil mentioned that you may be exhibiting one or both of these tomorrow.
Looking forward to meeting you tomorrow at NAMES.
Miniature engines always amaze me, nice job.
George your machining skills are just incredible. Do you magnifying aids when you are machining your miniatures?
