eira
Member
Joined: January 2014
Posts: 12 
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Post by eira on Feb 22, 2014 20:57:54 GMT -5
Wow, very detailed explanation thank you very much John.
Yes , I am facing difficulties during soldering small tube due to sometimes the melting solder partially or fully blocking the ID. Also, it's difficult to drill to create a very small hole.
Again, thank you very much for your advice.
Regards,
Eira
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Post by racket on Feb 22, 2014 23:06:12 GMT -5
Hi Eira
If you run into more problems, please ask more questions :-)
Making the fuel manifold is one of the more fiddly jobs on an engine , my first one was lotsa problems , but by the 3rd one it got much easier as I'd worked out the method.
If you don't have access to a Dremel and small drills to produce the desired clearance hole , it is possible to get a neat clearance hole using just the centre punch in the drill stand , if you can get hold of a "Ramset nail" , they're hardened and have a finely tapered point for forcing through thick metal , use it to "punch" a fine hole just big enough to force the syringe needle through ...............heh heh , I use to use them 50 years ago as a teenager to make the ignition hole in my home made muzzle loading gun barrels.
Cheers
John
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gidge348
Senior Member
Joined: September 2010
Posts: 426
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Post by gidge348 on Feb 23, 2014 3:22:18 GMT -5
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rythmnbls
Veteran Member
Joined: August 2011
Posts: 145
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Post by rythmnbls on Feb 23, 2014 8:59:30 GMT -5
Eira, Just re-iterate what John and Gidge have said, I use a 50% silver content silver solder with 2-3% nickel content, the nickel content helps with soldering to stainless steels. Also I generally make my manifolds out of annealed brass and punch holes with a sewing machine needle stolen from the wife.  Here s a link to a photo of the crime. i87.photobucket.com/albums/k142/madluther/Turbine%202/100_0988.jpgRegards. Steve. |
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Post by racket on Feb 23, 2014 16:06:51 GMT -5
Hi Steve
Yep , that nickel content sounds familiar ...............sewing machine needle would be ideal , ........ my brother has an old machine that he uses for sewing canvas, uses pretty hefty needles , might just have to checkout his supply, thanks for the suggestion :-)
Cheers
John
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eira
Member
Joined: January 2014
Posts: 12
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Post by eira on Feb 24, 2014 2:03:52 GMT -5
John, Gidge, and Steve,
thank you very much for your valuable and ingenious advice.
Another question,how did you make very circular and smooth fuel manifold from straiht tube?
I had tried, but it become oval, or if not, it became buckled.
thank you very much.
Regards,
Eira
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eira
Member
Joined: January 2014
Posts: 12
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Post by eira on Feb 24, 2014 2:04:19 GMT -5
John, Gidge, and Steve,
thank you very much for your valuable and ingenious advice.
Another question,how did you make very circular and smooth fuel manifold from straiht tube?
I had tried, but it become oval, or if not, it became buckled.
thank you very much.
Regards,
Eira
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Post by racket on Feb 24, 2014 3:10:29 GMT -5
Hi Eira
Wrap the tubing around a suitable sized diameter object , at the diameters I use its not too difficult but for smaller diameters you probably need to use something like a V belt pulley where the groove supports the sidewall of the tubing as its wrapped around ,
Always wrap ~400 degrees of circle , the 40 degrees of overlap can be cut off to get the right size circle .
Cheers
John
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eira
Member
Joined: January 2014
Posts: 12
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Post by eira on Mar 2, 2014 7:33:05 GMT -5
When I tried to understand internal component of Olympus amt jet, there are some things that I do not understand: 1. I saw a hole at its shaft housing. What is this hole for? how do we to make sizing of this/these hole(s)? 2. For front and rear bearing, how do we ensure the bearings lubricated?where are the lube injection point? 3. why does Olympus not using spring for bearing preload force? thank you very much. Eira What hole?  where are the injection point to bearing?  why no spring?  |
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Post by racket on Mar 2, 2014 16:47:28 GMT -5
Hi Eira
It looks like that hole supplies both the air for the bearing cooling as well as possibly an access point for the lube supply into the shaft area , the static pressure behind the comp and in front of the turbine wheel will be lower than at the "hole" , so both air and lube will exit via both bearings , this only my assumption , you'll need to examine the parts very carefully to verify that there are no other possibilities .
I'm a little confused about your query being on this Thread, the 10/98 engine uses "brass bush" bearings .
Cheers
John
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Post by racket on Mar 2, 2014 17:38:45 GMT -5
Hi Eira Have you considered joining the GTBA..... www.gtba.co.uk/ they have a lot more expertise with smaller micro engines, I feel it would be well worth the modest cost involved to obtain the best advice, especially when it comes to setting up the bearings, preload sand lubrication , if there are any shortcomings with these critical components you'll very quickly wreck your engine . Cheers John |
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eira
Member
Joined: January 2014
Posts: 12
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Post by eira on Mar 15, 2014 7:04:55 GMT -5
Thanks John.
regards,
Eira
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Post by azwood on Jun 29, 2018 3:17:47 GMT -5
Dam nice machine work looks great Garrett TV94 compressor with 98mm inducer 141mm exducer 10mm tip height in a 10 inch diameter diffuser stage |
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Post by racket on Jun 29, 2018 3:56:32 GMT -5
Its in Melbourne/Dandenong, go take a look ;-)
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Post by azwood on Jun 29, 2018 4:31:03 GMT -5
I thought you wernt from this state lol id love to see your work Its in Melbourne/Dandenong, go take a look ;-) |
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Here s a link to a photo of the crime. 