The Craftmans Shop > New from Old

Puma / Dorman 6LE / MacFarlane B46B / 110 kVA Generator Resurrection

<< < (11/60) > >>

PekkaNF:

--- Quote from: awemawson on October 05, 2019, 02:34:57 PM ---
The panels were retained by self tapping screws - I don't like self tapping screws in this situation, anyway they were quite rusty. I'll probably replace them with nuts and bolts as hand access to the rear is fairly good. I contemplated putting in 'hank bushes' and may still. At least there is no marking out to do, all the 'pilot holes' being there already !

--- End quote ---

Do you want to try any M4 or M5 press nuts?
https://madmodder.net/index.php/topic,11012.msg151330.html#msg151330



I have only M3-M5, they are all stainless steel. Only downside is that they need a reamer or pretty good exact diamter drill. EG. M4 is 5.41mm and I need to check if I have correct one for the steel sheet thickness you have. Can't really remember for which gauge I have them. Send msg. if you are interested. I could send you envelope up to weigh limit. They are all stainless steel. Gave aluminium ones to my brother.

Muzzerboy:
The "PEM" style inserts mentioned above require precise hole sizes and "proper" tooling to ensure consistent and reliable setting. They rely on the sheet metal flowing into features in the insert. Great for volume production but not something you can do reliably in a home workshop with a hammer for instance, particularly if you are inserting them into steel.

I've used "rivet nuts" to good effect, available from a variety of places and fitted rather like pop rivets. Simple and quick, available in sizes up to M12 or so.
CPC stock them at reasonable prices:
https://cpc.farnell.com/search?st=rivet%20nut%20tool

WeldingRod:
I vote rivet nuts too!  I've had good luck with them.

Sent from my SAMSUNG-SM-G891A using Tapatalk

John Rudd:
Rivnuts here too....

I used them when building up the enclosures for the vfd drives for my mills and lathes....Makes attaching everything so much easier....and easier to dismount parts if the need arises.. :coffee:

awemawson:
Thanks chaps for the offers and the suggestions - much appreciated but I've decided on Hank Bushes as I have the kit to fit them.

This morning I set too replacing the eight anti-vibration rubber bobbins that secure the main cabinet to the chassis. Originals were 3/8" UNF x 32 mm tall male male. My replacements are M8 20 mm tall and male female. I saw this as a potential advantage when it comes to fitting, but obviously I needed spacers to make up the 12 mm shortfall. I made eight delrin spacers and 'set too'. It was only then that I discovered that five of the eight originals had been screwed into tapped holes in the chassis rather than held by nuts from below - this necessitated not only unscrewing them but lifting the cabinet even further and drilling out the threaded holes to 8 mm clearance. I got there in the end  :thumbup:

In the process of replacing the rubber bobbins I also removed the cabinet heater, that actually is a green house heater if I'm not mistaken - it doesn't work but I think it's probably a good idea keeping the cabinet dry so will get a replacement.

Then I wanted to sort out the main output terminals as they were flopping about unfixed at one end, not good with this sort of power behind them :bugeye: To my horror I then found that they had only been fixed with self tapping screws one of which had pulled out - the cables attached to these terminals are massively heavy and self tappers are in my opinion definitely NOT correct in this situation. I drilled them out, fitted hank bushes and bolted it back securely.

So, no excuse, get ready for painting. A last go over with a wire brush, a bit of masking of things not to be sprayed, and an acceptance that it's not going to be a perfect job, as the more I look the more bits of flaking paint I see !

So a wipe down with a rag soaked in the 'Universal Thinners' that the paint uses, drag the machine out on the fork lift, spread a tarpaulin to limit the mess on the floor, plonk the machine back on bearers and mix up some paint.

This is when things started to go wrong - I pour paint into a mixing cup through a paint filter funnel but this time I succeeded in overbalancing the cup and funnel dropping a fair amount of paint in the process  :bang:

Clearing up the mess I started spraying and it went quite well - first gun load of paint went on nicely. Diluting the second batch I messed up somewhere as initially it was far too viscous, and when I added a bit of thinners I went too far in the other direction and ended up with some runs. Still this is only the first coat - at least one more to follow and an opportunity to rub down in between.

Still it definitely looks far 'bluer'  :clap:

Navigation

[0] Message Index

[#] Next page

[*] Previous page