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| Stuart S50 stationary engine. |
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| mechman48:
--- Quote from: SwarfnStuff on May 06, 2017, 01:50:07 AM ---Hey, just how do you ream the OD of something? :lol: He he, I know it's just a typo OR I'm completely lost here. Good post to follow, Thanks for posting Mechman. John B --- End quote --- Yeah, typical typo when you abbreviate sentences, but I think you sussed it out :headbang: George. |
| mechman48:
Update on the S50... Machined up the eccentric & the eccentric strap; the eccentric offset was going to be done in the 4 jaw chuck but found that by judicially making up a packing piece & placing it under one jaw on the 3 jaw chuck, the throw could be set up quite accurately not 100% perfect but as near as makes very little difference from my past experiences. The strap was centered up by using my tool centre height surface gauge to mark out radial lines & where they intersected was the centre of the blank, fortunately for me all the lines intersected quite nicely but if not where the lines leave a miniscule gap the centre can be located by eye well enough, maybe plus the use of a loupe for those with elderly eyesight, (which includes me!) for all intents & purposes. Next step just need to machine the strap to width, drill & tap for locking bolt & split. the eccentric needs to have the grub screw location drilled & tapped then all to be cleaned up & polished. The last pic is the start of preparation for paint up, etch primer & first coat on the cylinder assembly & flywheel... yeh I know... its obvious but... :med: I realise that there are many hobbyist out there that are capable of & have done many superb & complicated models so some readers may find this write up boring ( Yawn ) & some may say 'well I did it this/that way' but in the words of 'ol blue eyes... 'I did it my way', the intent is that, hopefully, newbies or those with very little experience will find it of some help, so I will continue to write this up, along with pics... :headbang: |
| DMIOM:
--- Quote from: mechman48 on May 07, 2017, 06:44:37 AM ---..... fortunately for me all the lines intersected quite nicely but if not where the lines leave a miniscule gap the centre can be located by eye well enough..... --- End quote --- Known as the 'cocked hat' by navigators plotting fixes. Dave |
| SwarfnStuff:
Yeah, Please keep going George. I'm learning stuff here along with many others I would guess. Besides, it's a good write up. :clap: :thumbup: John B |
| mechman48:
S50 :update: ... A note of caution, before machining the eccentric strap machine the strap down to dimensions for the thickness before boring out, I didn't & when nipping up in the mill vice it squeezed 'out of round' :Doh: . why I thought of using the mill at that point I cannot for the life of me remember! should of used a mandrel in the first place... brain fade no doubt :doh: Rather than make a complete new strap I ended up pressing a 5/8" silver steel (drill rod) mandrel through to get the bore back to round... not 100% but as near as dammit, then machined to thickness, we'll see how it turns out when fitted & turned over :scratch: pics show assembly, need to clean up & polish... |
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