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Right, I've since confirmed that my Compac 244A that has the gear disengaging is infact broken. It shouldn't be doing that. It's missing a spacer. That's why I didn't test with that one. Doesn't matter though since I was wrong and that whole style of indicator is unaffected by this issue anyway...

Replacing the liner with a cast iron one might be a way to go. Taper lapping is a little fiddly but not too bad. I've done it on an OS .46LA keeping the original pistons and actually gained performance by beating the factory tolerances. This was back before I had a milling machine too, I cut the...

the drilling jig is a great idea! I was hoping I was accurately repeating enough with my DRO to match my front cover to my crank case on the one I'm building right now, but with a jig to do both, I wouldn't have to hope. I've discovered with cast iron, you can reduce some of the dust by...

it's a common problem on forums everywhere. They're called different things in different shops on the same street nevermind different countries. There doesn't seem to be one clear word defining each type. The internals are definitely different though. When I'm buying online I most often see...

After giving myself 3 more chances to ruin 30 hours of work, the block is done! Now I'm going to start on the crankshaft. Thinking about using a ball end mill to cut a groove in it, then a matching groove in the pulley, then using a spring roll pin to lock it in place on the...

Yeah that's what mitutoyo seems to recommend, they spec a helper spring for upside down use.

I also cannot make any of these effects happen with my Starret Last Word DTI, my Brown and Sharp plunger back DTI, my Tesatest 0.0001" DTI. My cheap chinese DTI also does not do any of these effects, seems unaffected by position. I didn't test my Compac 244A because that's known broken. Missing...

I suspected the same, that both of my indicators wouldn't have had a problem, until finding this out. I just finished testing mine. They're both cheap. Sub-$40. Unfortunately I spent all my money on test indicators, and I only have cheap dial indicators. The results surprised me though. The...

relative to gravity ;)

I'm really hoping someone would provide supporting data or documentation from opposing point of views. I'd love to solidify this, but there isn't much here other than experience to the contrary, which I'm not discounting but like a good scientist, I can't confirm or inspect the results by...

This type of indicator, Are susceptible because they're a relatively large mass suspended from a spring. In order to keep reading pressures as low as possible it necessarily can't work the same way the other way around. I suspect it's not a black and white thing, rather it may be a very slight...

Wow that was miserable. Setup to cut the scallops, and the first one I didnt' check surface finish till I was 0.007" from dimension. I needed to sharpen and adjust the angle on the boring bar. Managed to pull it off. Switched to the other side, and I jerked the handle which fed too fast and...

Remember, this is for dial indicators, not dial test indicators. I made a mistake in my first post but I'm unable to edit the title for some reason. Something like this: I didn't believe it at first either even though I trust Long Island Indicator, so I went looking for manufacturer...

I stand corrected! It's not a problem with dial test indicators, they should work upside down. The problem is with dial (plunger style) indicators with the plunger up. They won't necessarily return to zero. My appologies, my original post is wrong. I corrected it. Still didn't know that about...

I learned something important about dial indicators this weekend while dialing in a horizontal bore on my horizontal mill. http://www.longislandindicator.com/p139.html "We had a belligerent customer whose dial indicator wasn't returning to zero when he used it upside down. We told him...

I managed to forget to get pictures of making the entire front case cover. Sorry! After turning the front case, I drilled the bolt holes on the mill. I screwed up the setup and didn't have enough range on one axis to drill the last two holes, so I'll get them when I set it up to cut the...

I use a tapping block like that all the time. A close fit to the tap thread major diameter seems to be fine. If the hole I need to thread is so deep and the material so hard that I'm concerned, I'm locating the tap with a spring center on the mill. Especially in aluminium, I almost always spend...

I wouldn't bother with a flex hone, it's not nearly as controllable for the tolerances we need for these little engines. It'll also tend to take more material off near the ports because it can expand into them. I haven't done the bollaero specifically, but I've done a few cylinder liners and...

I've got a thing for the Merlin engines after working on a full size Lancaster bomber at the Nanton air museum as a kid. Recently got to hear them run. Can't wait to hear this one run!

And the HF spindle is the left side and the chuck you want to mount goes on the right side? My lathe is very similar, with a flat back and a depression like that. I bolted the depression side (of the welded adapter) to the lathe it was going to run on to turn the threads and the register for...