Stuart Twin Victoria (Princess Royal) Mill Engine

[JasonB]

On JasonB Said:

Grinding bit in a Dremel would smooth the casting or brick acid is good for getting scale off steel so should work on CI.

Yes I’d use JBW these days

Tried the Dremel a couple of days ago, with grinding bits and the abrasive cylinders, but it didn’t touch the scale. It’s like very hard glass. I’ll get some acid and try that.

[JasonBModerator @jasonb]

Let me just check it won’t attack the iron, will put some in this morning and report back.

[JasonB]

On JasonB Said:

Let me just check it won’t attack the iron, will put some in this morning and report back.

Thanks Jason, I can get some from Screwfix down the road if it’s suitable.

[JasonBModerator @jasonb]

While it ddd not attack the CI sample it did seem “damp” which I assume is some of the acid soaking into the porus iron. So probably not the best idea as the acid may come back to haunt you in the form of rust. It also did not attack the paint that was on one face of the sample.

[JasonBModerator @jasonb]

While it did not attack the CI sample it did seem “damp” which I assume is some of the acid soaking into the porus iron. So probably not the best idea as the acid may come back to haunt you in the form of rust. It also did not attack the paint that was on one face of the sample.

[JasonB]

On JasonB Said:

While it did not attack the CI sample it did seem “damp” which I assume is some of the acid soaking into the porus iron. So probably not the best idea as the acid may come back to haunt you in the form of rust. It also did not attack the paint that was on one face of the sample.

Ok thanks for that. I’ll continue with chipping it away and filling the rest.

[Dr_GMJNParticipant @dr_gmjn]

I got the broach. It came with a small shim, but I assume that any shim would need to be at least as long as the bush/hub for it to work properly?

Also, when setting up in the press, is it a good idea to angle the work slightly so that the ram is always pressing the broach towards the bush? I think it was Ramon who mentioned that a broach could climb into the work and cause issues.

 

[JasonBModerator @jasonb]

Yes you would want to make a longer shim so the broach is supported through the whole length of the hub.

I’ve always done it vertically.

[Dr_GMJNParticipant @dr_gmjn]

Continued with de-scaling the wheels. I’ve run out of grinding bits for the Dremel, so have had to pause until new ones arrive next week.

Gave me chance to consider the barring slots again – I think they will have to be a separate insert after all to to space constraints at the rim. I think I could possibly get away from laser-cutting by turning an insert from mild steel – or mill a ring using the R/T, then fit it with JB Weld, then cut the slots. I suppose the insert would have to be perhaps 1 mm or so deeper than the slot depth to keep everything looking like a one-piece casting. Ideally I’d paint it final colour before milling the slots to save a load of masking. I like the look of plain metal on the machined slots.

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