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Old 05-26-2017, 01:33 PM   #181
apointofview
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Back from the vacation and got a bit of time to work on the boat. What I came up with for a boiler feed pump is possibly the ugliest item I have made so far. I have to get better at planning ahead. My design on the fly attitude has served me well but more and more I see the need for plans. My lack of patience for drawing out designs is the biggest reason I haven't looked into CAD. I should since fusion 360 is free but that's a whole new skill for my already full brain. I have discovered if I learn something new I forget something old !

Anyway back to the modern art looking pump. I used 3/16 rubber balls for the check valves and cut the metal so that both ball seats are not buried in a bore of some kind. I did that because I haven't had great success with getting these types of check valves to seal well and I thought being able to inspect the seat and adjust it out in the open would help. I didn't take many pictures for these parts, I was just keeping my head down and cutting metal, kind of winding down from the trip overseas. I still need to fit a mounting bracket and plumb it in but quick test with no real load is promising. I will take an exploded view picture of the pump and post it to be more clear on the design
Pete
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Old 05-26-2017, 01:49 PM   #182
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Next is to build something to drive the pump. I wanted make a worm gear using a 5/16 - 16 tap. My plan was to hob a brass blank and just cut into it and reduce the diameter slowly until I like the reduction ratio. I didn't try calculating what I needed I just dove in. That didn't work out at all. Even at the smallest diameter I could thread the reduction was way too much, something new for the scrap bin. I went on a search to buy a set of gears. My setup requires the gear system to output at 90 degrees to the input shaft. I haven't tried to cut real gears yet let alone helical or bevel types. I didn't have any luck finding a source for what I wanted. Google suggested a ring and pinion set from an r/c truck ! I have a t-maxx and it goes thru parts like crazy so I looked through the spares I have and its ring and pinion are too big. A trip to the LHS and I came out with a nice 1/16 scale truck ring and pinion set. They look good and are made of something that carbide wont cut. I had to remove the center with a diamond grinding bit in my dremel. I started with a press fit sleeve to couple the pinion to the steam engine shaft. Then a couple of brackets to hold the ring gear and shaft. One adapter has been made to mount the ring to the shaft and I got to use the new toy my wife gave me. I have cheap Chinese scales on my mill and now they are connected to a blue tooth adapter and using TouchDRO. It works great and it allowed me to drill the three hole circle pattern in the adapter without using my rotary table. I highly recommend it ! It's been to long since geometry so I had to go to the internet to find a calculator to give me a correct radius for the circle. That was a long winded update wasn't it.
Pete
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Old 05-26-2017, 01:51 PM   #183
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