Titanic stuart triple compound crankshaft balance weights part 8

After having a go at machining the castings I decided to make them I feel a better way. If you were wondering how long it would take... well I made 6 of these...

[@EnglishHobbyMachinist]

Sometimes castings can be harder to fabricate into the intended part than bar stock, that's why I prefer to build from scratch "usually more to hold on to" Nice job 👍

[@StuartsShed]

That’s an excellent approach to making those awkward parts. Very well planned. Your mandrel for the castings was a good idea too.

[@modelengineeringadventures]

Thanks Stuart working on the heads now there must be over 50 holes to drill and tap

[@CreaseysWorkshop]

It's a really good idea to put a piece of thick vinyl or leather on the front of your carriage to shield your lathe bed from chips and other abrasive substances.

[@modelengineeringadventures]

I normally do have an aluminum catch tray...but the leather idea is a useful one.

[@MrFactotum]

hi Andy
great job,
at the beginning, in my head i was saying make them from solid, then you stole my thunder🤣🤣
well done they look great👍👍👍👍👍👍
regards
Kev

[@modelengineeringadventures]

Thanks Kev

[@jobkneppers]

Dear sir, some, maybe, suggestions from my side. As a first; I would start with a solid bar too but would mount it in a horizontal dividing head and support it with a center and/or machining jack. If you use a center then the end needs a part left untouched to keep the center at work. In this setup you can easily mill all the required angles on the already turned to diameter bar. After this I wouldn't part the pieces of in the lathe like you did. I think it's a somewhat sketchy set-up with risks (e.g. breaking a parting tool) I would saw them close to the desired width and mount them with an added counterpiece in the chuck of the lathe (or a big soft collet) and machine the recess and chamfer this side. Turn it 180 degrees in the collet or soft jaws, clock them parallel and finish the part. I know this is just another way to get to Rome but I would certainly avoid parting of the part with an interrupted cut and quite a stick out from the chuck. If it grabs your done with tooling and parts. Thank you for sharing your work. Best! Job

[@modelengineeringadventures]

All the above is very useful info thank you for taking the time to comment. I think I was lucky it was only cast iron. In hindsight, all of the above is very correct.

[@johnfriend240]

Watch the tool stick out; you can shorten up on these operations for more rigidity, less chatter, especially with the interrupted cuts.

[@kevinsellsit5584]

At 24:12 "Now I was nervous about this double interrupted cut"... nervous? I was hiding under my desk!

[@modelengineeringadventures]

ha ha ha

[@Steviegtr52]

Hi Andrew, nice work. Do they have to be a specific weight.
Steve.

[@modelengineeringadventures]

thanks Steve....not really just to dimensions on the plan