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Post by racket on Apr 14, 2015 23:42:37 GMT -5
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Post by racket on Apr 26, 2015 1:39:12 GMT -5
Hi Guys Bit of an update The shaft tunnel has been started on , bored for thrust washer and bearings along with circlip grooves ............nothing interesting so no pic . The rear of the diffuser wall has kept me busy for a few days , I had to make up a jig to fix the front of the diffuser wall to so that the rear could be machined true to the front as well as a requirement for a "Datum Point" that the rear "steps" could be machined to for correct axial positioning of the comp wheel and thrust bearing/clearances . Pic of jig Diffuser wall finished I can now finish drilling through the diffuser wall for the 4 X 8mm screws that will hold it to the shaft tunnel , then drill and tap the shaft tunnel to mate with the diffuser . Cheers John
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Deleted
Joined: January 1970
Posts: 0
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Post by Deleted on Apr 26, 2015 2:24:24 GMT -5
Hi John
guess the weather not been to good then, seems you been spending plenty of time in the work shop :-) really looking good, as all your work does :-)
All Best Andy
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rythmnbls
Veteran Member
Joined: August 2011
Posts: 145
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Post by rythmnbls on Apr 26, 2015 7:42:56 GMT -5
Nice work, I'll bet you were knee deep in aluminium chips after finishing.
Steve.
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Post by pitciblackscotland on Apr 26, 2015 8:22:00 GMT -5
Hi John, Yes i can see it would be a bit of work on that large chunk of hollow steel bar Cheers, Mark.
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Post by racket on Apr 27, 2015 0:56:42 GMT -5
LOL, yep theres a pile of alloy chips :-)
Yeh Mark , it took a while to get it cleaned up and "round" .
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Post by racket on Apr 27, 2015 17:57:21 GMT -5
Hi Guys A bit of a mock up to check axial clearances , "dry" thrust bearing clearance was "just right" , a definite "klunk" back and forth , comp exducer to shroud needed 3 layers of masking tape on the blade tips before there was some resistance to movement , if I take off the 1 layer for axial thrust bearing clearance that leaves ~0.006" - 0.15mm blade to shroud , pushing the comp nut from side to side didn't produce inducer tip to shroud touching , it has 0.015" radial clearance ( 0.030" diametric) , weight to this stage ~8.5 kgs- 19 lbs . A few pics Cheers John
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Post by pitciblackscotland on Apr 27, 2015 18:37:55 GMT -5
Hi John, She coming together slowly, looking good. Thanks for the photos Cheers, Mark.
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Post by racket on Apr 27, 2015 19:02:30 GMT -5
Hi Mark
Yep , its up to a stage now where I can leave it and get on with the house painting :-(
Cheers John
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Post by enginewhisperer on Apr 27, 2015 19:39:05 GMT -5
that's a pretty nice looking fan!
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Post by racket on Apr 27, 2015 19:43:43 GMT -5
LOL............sure is ;-)
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Post by Johansson on Apr 27, 2015 23:00:03 GMT -5
Stunning!
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Post by racket on Apr 30, 2015 2:23:03 GMT -5
Hi Mark Heres those pics of the "repairs" to the turbine end of the bearing bore where those "hard bits" ruined the initial bore through because my crappy old lathe has just too much play in it to hold a straight line when it encounters an obstacle , .............LOL, along with it doing a tapered bore . Heres the machined up jig in my small lathe , theres a "bolt on/replaceable"central raised section thats a neat radial fit into the thrust washer pocket that was originally machined concentrically with the bore and square to the mounting face ,the raised "disc" is a bit shorter axially than the thrust washer pocket , .......... when the main body of the shaft tunnel is held down on the machined jig surface everything should be running true ............hopefully :-( With the central bolt holding the shaft tunnel against the jig the turb end of the shaft tunnel OD was machined down a millimetre so that it will now be true to the bore and which will eventually located the NGV concentric to both And finally with the 4 external "clamps" fitted and the central bolt removed the bore was trued up after marking the entire bearing surface with a marking pen to find the "high spots" , heh heh , they were like shiny little islands in a black sea after the first light cut to remove a thou . Cheers John
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Post by pitciblackscotland on Apr 30, 2015 3:18:46 GMT -5
Hi John, Ahhh!!! now i can understand, nice piece of steel plate you have there John My local scrappy had a 50mm thick plate about the same size you have will go there first thing tomorrow morning. Thanks for the pics John Cheers, Mark.
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Post by racket on Apr 30, 2015 5:00:38 GMT -5
Hi Mark
LOL.....Heavy duty mate , heavy duty , just the way you like it , no flex in that plate ;-)
Cheers John
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