Author Topic: PMR Feed Pump build  (Read 10611 times)

Offline sshire

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Re: PMR Feed Pump build
« Reply #15 on: August 30, 2013, 11:59:12 PM »
Kerrin
Not a problem. I'm learning UK English, Oz English and New Zealand English. A total learning experience.

Best,
Stan

Offline sshire

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Re: PMR Feed Pump build
« Reply #16 on: August 31, 2013, 12:00:02 AM »
Now that the feed pump has been milled and a cleanup of the casting has begun, the drilling and threading commences.
With the casting in the vise, I checked for level.



The inlet and outlets were drilled and tapped. I'm using " copper tubing from the big box store. I also picked up some " to ⅛" compression fittings that I will modify to thread into the inlet and outlet.



The drilling sequence





I used an end mill here to get the flat bottomed hole.





Just following the sequence



Then the casting is turned, checked for level and plumb and another sequence is done.



Tomorrow, the gland nuts and the rest of the parts. Should be pumping water by the end of the day.



And, yesterday, as promised, the replacement boiler parts were at the front door.



Quick build so far. a nice pump kit. When this is done, we'll go back to the boiler.

Best
Stan
Best,
Stan

Offline Don1966

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Re: PMR Feed Pump build
« Reply #17 on: August 31, 2013, 12:09:29 AM »
Stan, your really moving along here bud. Looking great and I am taking notes here man.

Don

Offline b.lindsey

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Re: PMR Feed Pump build
« Reply #18 on: August 31, 2013, 12:47:06 AM »
Some more nice progress today Stan. At this rate you may well be the poster craftsman for CF 2014 :)

Bill
« Last Edit: August 31, 2013, 01:12:37 AM by b.lindsey »

Offline sshire

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Re: PMR Feed Pump build
« Reply #19 on: August 31, 2013, 01:04:00 AM »
Maybe in quantity only
Best,
Stan

Offline sshire

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Re: PMR Feed Pump build
« Reply #20 on: September 01, 2013, 04:19:56 PM »
Gland nuts and the rest of the bits

The gland nut is turned from supplied hex brass. Just following the drawing.



The drawing said 0.560.



Then the BA die (not British Association), more like Big A**.
The only one I could find was a 1-" diameter. Just what I needed, a break to turn a die holder.



Then drilled, reamed to .375 and done. When I test fit the piston after reaming it was tight. I remember reading a build thread on this pump by Simon and he had some tightness here also. I was about to go his route with TimeSaver compound, but decided to run the reamer one more time as a "spring pass." The piston slid in perfectly this time.







A test fit to check the threading.



Then the plug.



Both nuts in place.



The pump handle was cut to length, drilled and finished with a trip to Oliver.



Spotting the gudgeons. Not being a birdwatcher, I've never spotted a gudgeon in the wild.



Centering the piston for slotting.



The slot is to be 60 thou larger than my .125 end mill. First the center passes (I'm really feeding slowly with a .125 bit and 303 stainless. Plenty of hand dripped coolant) and then the two 30 thou offset passes to the finished width.



Drill the mounting holes in the feet.



I had thought of using .125 E-clips in the gudgeon pins instead of the supplied clevis pins. I'm sure the 5C collet has about 1/32" in its grasp. I did manage to cut the groove, but I'd need a longer pin to make this work and I wasn't thrilled with the look of the whole rivet-as-gudgeon-pin assembly.



Like Simon, I replaced the gudgeon pins with screws (6-32 SS)



So, done. It does pump water. Take my word on that until I get it properly mounted as I was holding the pump to the kitchen counter with one hand while using the pump handle with the other, and propping up the inlet test hose with my shoulder.



Thanks for following along
Stan

Best,
Stan

Online Jo

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Re: PMR Feed Pump build
« Reply #21 on: September 01, 2013, 04:49:00 PM »
Nice  :ThumbsUp:

You are brave with that little slot cutter  :o.. I would have turned it 90 degrees and used a slitting saw  ;).

Boiler time again  :???:?

Jo
Enjoyment is more important than achievement.

Offline smfr

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Re: PMR Feed Pump build
« Reply #22 on: September 01, 2013, 05:18:46 PM »
Looks great, Stan! I hope my build log was useful. To be honest I still haven't finished off the fasterners for the linkage on mine; I suspect that a single nut will work loose in action, so lock nuts are probably required.

One thing I noticed; the insert you're using to cut the bevels on the nuts looks like it has a corner angle of a bit over 90deg, making your nut bevels just a hit steep. Nut bevels are normally at 30deg, so a 60deg threading tool gives the right bevel angle.

Simon

Offline Don1966

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Re: PMR Feed Pump build
« Reply #23 on: September 01, 2013, 05:42:42 PM »
Looks good Stan and that was quick.

Don

Offline sshire

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Re: PMR Feed Pump build
« Reply #24 on: September 01, 2013, 05:46:35 PM »
Jo
I was concerned that since my widest slitting saw is .06, the .187 slot would be many cuts, most with one side of the saw unsupported. I suppose it's my minimal experience with them plus probably not knowing the correct procedure that pointed me to the end mill. Any suggestions for using the saw would be appreciated.

Simon
Your log was very useful. Thanks! I just found thin, 6-32 lock nuts at McMaster

http://www.mcmaster.com/#hex-locknuts/=obiozs

Best,
Stan

Offline sshire

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Re: PMR Feed Pump build
« Reply #25 on: September 01, 2013, 05:50:35 PM »
Don
A kit with 5 parts to be made is right up my alley. Plus, PMR supplies everything so no running around or waiting for Richie, my UPS guy.
Best,
Stan

Offline b.lindsey

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Re: PMR Feed Pump build
« Reply #26 on: September 01, 2013, 08:52:20 PM »
Great log Stan. Now with your log and Simon's, maybe i can attack my casting kit :)

Bill

Offline sshire

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Re: PMR Feed Pump build
« Reply #27 on: September 01, 2013, 08:53:51 PM »
Easy, Bill. I did have a bowl of soup so I could use the empty can for a test water tank.
Best,
Stan

Offline b.lindsey

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Re: PMR Feed Pump build
« Reply #28 on: September 01, 2013, 08:55:42 PM »
Lol....i can manage the soup part :)

Bill

Offline NickG

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Re: PMR Feed Pump build
« Reply #29 on: September 01, 2013, 09:51:27 PM »
Nice work Stan, looks like a good pump. The non return valves you were talking about are commonly known as clack valves or check valves too. It is normal to have them screwed into the boiler at any feed in point and not rely on the one in the pump, otherwise the pipe will be full of steam.