GW Staar
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- Joined
- Feb 26, 2009
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Rather than take over MikeMyer's Uniflow Thread, I need to start a new one on converting a regular Uniflow to the New Quick Change Version (minus the larger hopper that comes with the Quick Change in the store)
In the other thread I posted:
Higgite, responded:
Higgite, yes the housing knob is tight, pin is centered in the alignment hole. Tightened metering screw is shown in the following pictures....the powder kernals in each are win. 760 to illustrate the possible problem. The ridge you see varies from .004" to .011". Definitely, it's not flush anywhere.
BTW, I went to Sportsman's Warehouse to try to get a large metering screw and a powder emptying tube, but they don't stock them yet. That means another order to Midway.....and a few days wait to continue the review.
If your fit between the small metering screw and the cylinder is better than mine, I probably should email an RCBS engineer I know, and see if I got a bad metering screw sleeve.....darn....if so the review will be postponed.
If anyone has bought a new Uniflow Quick Change (they are now the same price at Sportsman's Warehouse as the small cavity regular Uniflow) we'd like to know your experience with the small metering screw's fit to the cylinder.....maybe they all match Higgite's good one.
The new Quick Change you buy now includes a bigger hopper, both large and small metering screws, the powder dump tube, and a couple of plastic drop tubes I believe. So far you can't buy the larger hopper at midway....probably requires a special parts order direct from RCBS.
In the other thread I posted:
Jesse: I got my conversion parts. They don't come polished and ready to use. I spent 10 minutes with mineral spriits to clean the anti-rust stuff off, buffed the parts and waxed them with plain paste wax. They, the small metering screw, the cylinder and the keeper/plunger thing. Go together smoothly now.
The design is interesting: you have to loosen the alignment pin housing a couple of turns before you can pull the spring-loaded pin to release it. Tightening the housing centers the pin in a hole in the metering screw's sleeve and locks it aligned. Yes I can see why you got impatient with it....not the most pleasant on fingers. There is a hole drilled in the pin housing shaft that would allow you to run a wire through it and make a pull loop.....that would make it easier to release, but not necessarily more pleasant on the fingers. Thinking...
I have decided that I need at least one more measuring screw to test this thing.
The drum is drilled for the large metering screw, so the small metering screw is inside a sleeve....that's how they get one drum to work with 2 sizes of metering screws.
I have reservations on the small metering screw....the sleeve's end doesn't match the drum perfectly at the cavity opening.....so it'll catch a few small powder kernals between the cavity and the sleeve and the cylinder....
Higgite, responded:
GW, do they not match nearly perfectly when the knurled keeper housing knob is tightened all the way? The reason I ask is that I just went and checked mine to see if it does as you described. I found that the contoured end of the sleeve can be either recessed into or protruding from the cylinder hole (depending on how hard you push the assembly into the cylinder) with the alignment pin seated but before the keeper knob is tightened down. But, once the keeper knob is tightened down, the end of the sleeve is almost perfectly smooth with the cylinder. I can feel the slightest lip in a couple of spots with my fingernail, but would be hard pressed to trap any powder at the end of the sleeve. Just FWIW.
Higgite, yes the housing knob is tight, pin is centered in the alignment hole. Tightened metering screw is shown in the following pictures....the powder kernals in each are win. 760 to illustrate the possible problem. The ridge you see varies from .004" to .011". Definitely, it's not flush anywhere.
BTW, I went to Sportsman's Warehouse to try to get a large metering screw and a powder emptying tube, but they don't stock them yet. That means another order to Midway.....and a few days wait to continue the review.
If your fit between the small metering screw and the cylinder is better than mine, I probably should email an RCBS engineer I know, and see if I got a bad metering screw sleeve.....darn....if so the review will be postponed.
If anyone has bought a new Uniflow Quick Change (they are now the same price at Sportsman's Warehouse as the small cavity regular Uniflow) we'd like to know your experience with the small metering screw's fit to the cylinder.....maybe they all match Higgite's good one.
The new Quick Change you buy now includes a bigger hopper, both large and small metering screws, the powder dump tube, and a couple of plastic drop tubes I believe. So far you can't buy the larger hopper at midway....probably requires a special parts order direct from RCBS.
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