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Post by 2 Dogs on Jun 3, 2022 9:55:51 GMT -5
Thank you guys for all your nice words.
By the time a guy calls me, he is trying to be more accurate. Since accuracy is every other word out of my mouth I correct cylinder throats in the most accurate way possible. I don’t charge guys to measure and evaluate their cylinders and I’m happy to answer any questions you might have even if you don’t use my services. There’s a definite order to getting your sixgun right. Most of the information you read on the internet isn’t wrong, it’s just not in the right order. Thanks!
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Post by cas on Jun 3, 2022 11:35:23 GMT -5
Is there a quick and dirty way to tell if your throats are too small without pin gauges? Look at em. After doing them for so long I got to where I could look at them and judge if they were undersized or not and be right about 90% of the time. lol Pin gauges won't tell you if your throats are round. Some people will say how and the heck can they not be round if they were made with a chamber reamer? I do not know. But I have seen several that sure as heck weren't.
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Post by leadhound on Jun 3, 2022 12:01:23 GMT -5
Pin gauges won't tell you if your throats are round. Some people will say how and the heck can they not be round if they were made with a chamber reamer? I do not know. But I have seen several that sure as heck weren't. Multitude of reasons once you get into tolerance stacking. Anywhere from setup to tool wear, machine rigidity and heat treatment.
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Post by cas on Jun 3, 2022 12:08:13 GMT -5
Strangest by far was a Taurus revolver. Looking at the face of the cylinder, the throat seemed pretty normal. Looking at it from the chamber end, it was extremely oblong. Almost like they ran the reamer in at an angle, then took it out, then ran it in again at a different angle, neither of them true to the center line. Yet the chamber seemed pretty normal to the naked eye.
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jeffh
.375 Atomic
Posts: 1,730
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Post by jeffh on Jun 3, 2022 13:41:15 GMT -5
***** There is nothing casual about metal removal on a pistol. Easy to remove asymmetrically, and you can’t put it back. I would not buy a revolver from someone who hand-reamed CHAMBER EXIT HOLES. Chances are excellent the axis of a hand-reamed exit hole (aka throat) will end up eccentric to the chamber itself. While to drop an unsupported reamer into a chamber may produce a round hole, there is no guarantee the reamer will center the hole on the chamber axis. A hone may be better than a reamer. However, either process requires technique. David Bradshaw
That's not easy to detect by the eye or with pin gauges either.
"Small hole gauges" will reveal such a problem, whereas pin gauges won't. You'll need a micrometer to go with them.
I'm not knocking pin gauges, just offering a way to detect certain problems.
Mine are Starrett, but if I had to buy a set today, I'd go for one of the $20 sets. The actual measuring device is your micrometer, so that should be a good one.
EDIT: You can use the small holes gauges in place of pin gauges too, if you can't afford both. It's just not as slick as trying different pins. I always measure two or three times, write it all down and check again the next day. Not that the material changes, but I have actually managed to read good holes as bad and bad holes as good one day, and the opposite the next. Not every time, but it's happened. Slugging and mic'ing go hand-in-hand as well as pushing/dropping jacketed bullets through. I'm not a machinist by any stretch, but have used precision measuring tools extensively and I tend to measure every way I can and multiple times. I used to have to reject thousands of feet of tubing passed by another inspector. This was very uncomfortable, so I learned to be as thorough as possible so as not to possibly cause unnecessary heartache.
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Post by parallaxbill on Jun 3, 2022 14:32:48 GMT -5
If a hole is not round after it has been reamed properly the predrilled and bored hole was probably so far out of alignment or out of round that the reamer had no chance of cutting whatever material remained in the hole. If all the prep work was correct the reamer will make a nice round hole.
Plus, you can detect out of round holes with pin gauges by fitting a pin gauge in the hole, if the pin wiggles side to side even slightly, your hole is probably out of round. But small hole gauges and micrometers will let you know just how much.
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Post by 2 Dogs on Jun 3, 2022 15:43:00 GMT -5
Is there a quick and dirty way to tell if your throats are too small without pin gauges? Look at em. After doing them for so long I got to where I could look at them and judge if they were undersized or not and be right about 90% of the time. lol Pin gauges won't tell you if your throats are round. Some people will say how and the heck can they not be round if they were made with a chamber reamer? I do not know. But I have seen several that sure as heck weren't. This is correct. Often I see them oval, blunderbussed, and sometimes even hourglassed. Not only are they often not round but they have a major and a minor surface on the inside surface. Running a reamer dead center down the throat will reveal this. So what we are trying to do is make the hole as round as possible without going to the next size up. I’m not a fan of using a hone. My results speak for themselves. I use the method Alan Harton taught me.
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Post by prisedefer on Jun 3, 2022 15:52:09 GMT -5
Thank you gentlemen, you're fast, fast on the draw. And what you say makes good sense.
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aciera
.375 Atomic
Posts: 2,186
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Post by aciera on Jun 4, 2022 14:57:21 GMT -5
Pins can tell out of round......... Put a pair in.....a .250&.251........tight or loose. You can feel. And taper. But .0001 instead of .001 sets are better. Or pair of + and - Sets used together...... Feel means a lot too. Just an Ol Phart that does such things.
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Post by parallaxbill on Jun 4, 2022 15:33:38 GMT -5
Very true, but it gets $$$ expensive buying all those pins. I had them in my shop, but unfortunately not any more.
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edk
.375 Atomic
Posts: 1,153
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Post by edk on Jun 5, 2022 15:54:03 GMT -5
Small hole gages are pretty tricky for someone not experienced in metrology.
American made pin sets missing a few pins (in a non-critical zone) can often be had inexpensively.
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aciera
.375 Atomic
Posts: 2,186
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Post by aciera on Jun 5, 2022 18:17:50 GMT -5
Very true, but it gets $$$ expensive buying all those pins. I had them in my shop, but unfortunately not any more. Agree......just looking at all options.
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