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Post by Johansson on Mar 26, 2015 16:23:51 GMT -5
Looking good John!
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Post by racket on Mar 26, 2015 16:35:14 GMT -5
Hi Anders
Yep , they turned out OK , only minor "dishing" from turning the corner over , but thats happened with all the previous engines as well .
Castings just arrived , can't wait to get machining , thanks Andrew :-)
Cheers
John
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Post by pitciblackscotland on Mar 26, 2015 18:35:05 GMT -5
Hi John,
Nice work and i see you got some items to play around with. I sent a email off to Globe motors to see what the price is for the micro gear pumps they have will let you know. But found these pumps that could be used??? eBay item number:301558808321 250810139654
Cheers,
Mark.
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Post by racket on Mar 26, 2015 19:24:30 GMT -5
Hi Mark
What voltage for those Ebay pumps ??
Cheers
John
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Post by pitciblackscotland on Mar 26, 2015 21:43:12 GMT -5
Hi John,
Forget the first one bloody hell look at the price!!! the other one i don't know. I'll ring you tonight.
Cheers,
Mark.
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Post by racket on Mar 26, 2015 22:42:02 GMT -5
Catch you then :-)
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Post by racket on Apr 10, 2015 22:52:14 GMT -5
Hi Guys I've been getting a bit done on the castings     Cheers John |
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Post by Johansson on Apr 11, 2015 0:14:49 GMT -5
Really nice pieces there John! How have you planned to route the oil drainage?
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Joined: January 1970
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Post by Deleted on Apr 11, 2015 1:08:15 GMT -5
Very Nice
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Post by racket on Apr 11, 2015 2:59:41 GMT -5
Hi Anders
LOL, I'm going to copy your method ;-)
1/2 inch copper plumbing pipe , or maybe 5/8" if theres room , which there should be with this 12 inch casing.
The cast in oil channels created other problems that required more work , I want it simple this time .
Yeh Andy , she's slowly coming together , I've been very lazy about writing up my build log though , maybe once I finish the comp housing .
Cheers
John
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Joined: January 1970
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Post by Deleted on Apr 11, 2015 3:28:38 GMT -5
Hi Anders LOL, I'm going to copy your method ;-) 1/2 inch copper plumbing pipe , or maybe 5/8" if theres room , which there should be with this 12 inch casing. The cast in oil channels created other problems that required more work , I want it simple this time . Yeh Andy , she's slowly coming together , I've been very lazy about writing up my build log though , maybe once I finish the comp housing . Cheers John Hi John When the weathers good to be in the work shop, you got to make the most of it :-) when not so good, you can tell us what you been doing. It is looking good, as all yours do All the Best Andy |
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Post by madpatty on Apr 11, 2015 6:30:11 GMT -5
Hi Racket,
HOw you achieve that compressor blade profile in the shroud.?
or you cast it that way and then polish it afterwards?
cheers,
Patty
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Post by pitciblackscotland on Apr 11, 2015 8:34:28 GMT -5
Hi John, Yep nice work as always  I bet you had a nice hot cuppa and sat down and admire your workmanship Cheers, Mark. |
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Post by racket on Apr 11, 2015 18:04:32 GMT -5
Hi Patty
Theres a "rough" profile in the raw casting , actually it was made for an ABB compressor wheel which just happened to be a similar size to the X831 comp wheel .
Actual machining of the profile is a slow process , several hours of work , firstly I bore to the correct size ( inducer diameter plus 0.030" diametric clearance) , then I roughly cleanup the casting shroud to make it reasonably "round".
I add 5 layers of masking tape ( 25mm wide) over every second inducer blade outer edge , this provides the ~0.015" radial clearance ( 0.030" diametric) .
I also add 5 layers on the blade edges from the "curve" to the exducer .
By the use of a marking pen making several marks across the shroud surface and fitting up the comp wheel with its tape to the shroud surface and slowly rotating the comp wheel its possible to find the "high spots" on the shroud , these are turned down using a "curved" cutting tool until the shroud profile is getting close to whats required .
Final finishing is done with various grades of sanding paper.
One of the hardest parts is getting the axial positioning correct with my design , but with your design shimming of the shroud is possible .
Cheers
JOhn
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Post by racket on Apr 11, 2015 18:08:11 GMT -5
Hi Andy
LOL, a nice sunny day and I'd sooner be at the beach or fishing off the rock wall than machining away in my shed , thankfully we've had a bit of wet weather :-)
Yep , bits are starting to take shape , but my machining skills are a bit rusty so things are taking twice as long as they should .
Cheers
John
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I bet you had a nice hot cuppa and sat down and admire your workmanship