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John Stevenson
03-10-2010, 06:24 PM
Been rushing round like a one armed paper hanger today and not getting anywhere fast.

Got a set of slip rings in, a stack of 12, what we call Christmas trees hence the title.
Three of the rings had no contact and two rings were connected so turn to lot off the former as they are all bonded from new and start again.

Turned 12 rings out of phossy bronze 82mm by 8mm wide and the tufnol spacer to match and drilled all the rod holes for the connector rods.

http://www.stevenson-engineers.co.uk/files/christmastree.jpg

This is where I got to at knock off tonight, all the rings and spacers done and two rings glued to the former so I can start on the assembly tomorrow.
Only had a couple of small jobs in today and been working on this all day and not seemed to get anywhere.

Both armatures on the bench are out of fork trucks and both need a respline where the hydraulic pump fits in the end, one should have gone out today but the gear cutters sent the wrong splined inserts.

.

motorworks
03-10-2010, 06:42 PM
Nice John
Me, I am having a hell of a month this week :)
Spent the am on board measuring holes for prop shaft bearings.
Got 12 Thordon marine bearings to machine in the am.
http://www.thordonbearings.com/
Did 4 yesterday.
Each one produces enough 'string' to fill a large recycleing bag
Bloody mess.
I will take pics on Thursday, if I have time.
eddie
ps Trade you the boat work for the motor work !!

John Stevenson
03-10-2010, 06:47 PM
Bugger off, I can't swim...................

Your Old Dog
03-10-2010, 07:13 PM
Damn good thing they didn't want 14 done or you'd of had to get another workbench :D

HSS
03-10-2010, 07:49 PM
Motorworks, doesn't that thordon use water for the lube? Tug boats here use thordon bearings for the prop shafts because of all the sand, if I'm not mistaken.

Patrick

motorworks
03-11-2010, 05:41 AM
Yes
They use water.These are going in our Coast Guard Boats :)

John Stevenson
03-11-2010, 08:22 AM
Christmas is on hold :D

Got a Fred Flintstone inverter in for repair - the bearings have gone, pics at 5:00

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small.planes
03-11-2010, 01:10 PM
Well?
Its at least twenty past six.....

Dave

Timleech
03-11-2010, 01:14 PM
Well?
Its at least twenty past six.....

Dave

He's gone down the pub instead......

Tim

small.planes
03-11-2010, 01:24 PM
What a splendid idea :D

Dave

darryl
03-11-2010, 02:39 PM
Great idea, the pub. Went there last night. Didn't do me a lot of good- here I am at home today typing on the computer instead of being at work-

John Stevenson
03-11-2010, 04:10 PM
He's gone down the pub instead......

Tim

How did you know ?
Steak night tonight 5.49 for a steak, chips and salad and a pint, clincher was, Gert was paying.

Anyway here a Fred Flintsone inverter or VDF

http://www.stevenson-engineers.co.uk/files/motorgen.jpg

This is what we used to use before electonic VFD's.

A motor generator, feed it 440 volt and get 240 volt out at 400 hz, mind you this is a big bugger though, runs a ring main round a woodworkshop to supply current to a row of copy routers.

Probably 10" diameter on the big bit and 40 odd inches long, bearing has welded itself to the tail end, meaning it's been cut off, turned undersize, welded up and turned back to 50mm diameter.

Christmas tree got finished last thing and gone back to get baked overnight, will get it back tomorrow for final skim and assemble the terminal block.

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Deja Vu
03-11-2010, 05:38 PM
From previous pictures, that chip pan looks like your floor, Sir John. ;)
...I really like the way you work!

I might add...when..er IF I get into a project, I'll work until there is no room to move around.

motorworks
03-11-2010, 06:58 PM
John
You are the Tom Waits of the machineshop....
Things all over the place, but when its done what comes out is
beautiful.....

http://www.youtube.com/watch?v=DHP-yN5KGN4&feature=PlayList&p=7B87A2591B1E3439&playnext=1&playnext_from=PL&index=47

eddie

oil mac
03-12-2010, 02:15 AM
At least working on ring shapes we come back to the start point or maybe vanish:D :eek: Still the world goes round, Nice work Sir John, I have a feeling down your way, if you were not around, there would be a lot of unhappy static bunnies with no one to bail them out, folk able to do the unusual job of work are rapidly vanishing from the radar.

John Stevenson
03-15-2010, 07:48 PM
Bit of a delay because I was told to drop it and do some more important repairs and it went away for a day to be baked.

http://www.stevenson-engineers.co.uk/files/christmastree1.jpg

Finished set of slip rings after the final skim and terminal block assembled/

.

wierdscience
03-15-2010, 09:16 PM
How did you know ?
Steak night tonight 5.49 for a steak, chips and salad and a pint, clincher was, Gert was paying.

Anyway here a Fred Flintsone inverter or VDF

http://www.stevenson-engineers.co.uk/files/motorgen.jpg

This is what we used to use before electonic VFD's.

A motor generator, feed it 440 volt and get 240 volt out at 400 hz, mind you this is a big bugger though, runs a ring main round a woodworkshop to supply current to a row of copy routers.

Probably 10" diameter on the big bit and 40 odd inches long, bearing has welded itself to the tail end, meaning it's been cut off, turned undersize, welded up and turned back to 50mm diameter.

Christmas tree got finished last thing and gone back to get baked overnight, will get it back tomorrow for final skim and assemble the terminal block.

.

What's the pink crap on the lathe?Bakelite dust?

John Stevenson
03-16-2010, 05:37 PM
What's the pink crap on the lathe?Bakelite dust?
Some of the larger slip rings due to material costs have brass tube segments with wires soldered to then that go to the terminal block on the top.
They are then cast into position in a jig using a form of glass fibre resin and filler.

Because I can't replicate this process on one off's, I bore / trepan the rings out out of the resin and silver solder ears on the inside to take connecting studs and use Tufnol / Phenolic as insulation rings in the rebuild.

The dust you can see is from a set of large 7" - 8" rings that have been reclaimed.

NzOldun
05-17-2012, 01:16 AM
Bit of a delay because I was told to drop it and do some more important repairs and it went away for a day to be baked.

http://www.stevenson-engineers.co.uk/files/christmastree1.jpg

Finished set of slip rings after the final skim and terminal block assembled/

.
My wife's comment on viewing you picture over my shoulder - Dalek!

J Tiers
05-17-2012, 08:42 AM
That red dust looks just like electrical "red insulator" stuff here..... glass-reinforced plastic that is as scratchy as heck, and tears up tools like crazy.

Done some of it for work before, now I won't..... won't have it in the shop...