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Post by 12ptdroptine on Mar 27, 2009 16:52:55 GMT -5
I started my cooling rod today. How much clearance should it have ? It slide's in OK now but seems to drag a little. I am thinking about taking a few more thousandth's off . Should it rattle any at all ? Drop
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Post by Harley on Mar 27, 2009 17:07:04 GMT -5
Drop, I think you want it as large as the barrel will accept; better and quicker heat transfer, less condensation, maybe.
Harley
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Post by ET on Mar 27, 2009 18:32:42 GMT -5
Drop I agree with Harley about the fit for efficiency but I also shaved mine a little bit on the mini lathe and then sanded areas seen that made contact with the bore for an almost no resistance contact fit.
Even though I did not have a cooler to house the rod in last fall I still used it and cycled it twice in my barrel that cut my normal cooling time in half. I was surprised at how warm the rod got when pulled out the first time to cool itself after about 3-minutes. Second time inserted for a period of time and removed there was very little additional warmth felt. Even though it does not reflect actual bore temp when conducting heat I sort of used it as a reference indicator when it was time to load again. When using a cooler for the rod this would not probably work as well as mentioned for an indicator because of the additional cold induced in the rod lowering it well below ambient temperature to start with.
I will be a newcomer to a cooling rod also and will find it interesting what observations might be revealed. First goal is getting the barrel back to temp when previous shot was made.
Ed
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Post by Richard on Mar 27, 2009 18:55:34 GMT -5
I also agree with droptine. Keep rod as close as possible to bore. Also, a newer procedure I have initiated the last two times out. After drying the rod off with a cotton t-shirt, I do a final wipe down with a piece of paper towel to ensure all moisture is off the rod. Can't say it is working any better than before, just a little extra insurance. If you cool every shot, you will not get any heat build up and can keep the rod in for a shorter period of time.
Richard
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Post by 12ptdroptine on Mar 27, 2009 20:38:16 GMT -5
I was very surprised while I was working on it with emry cloth and it got so hot it would burn your finger's.. Then I took it out of the drill press and cleaned it up . it was still pretty warm. I stuck it in the barrel for a fit check and pulled it out... I was really surprised at how fast the barrel pulled the heat out of it. As I said I think I will take another couple thousandths off.. I would sure hate to have the barrel cool down and get a little to tight on it. Drop
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Post by Buckrub on Mar 28, 2009 10:56:55 GMT -5
I guess I continue to be luckier with this gun that I thought originally.
My $4.00 off the shelf cooling rod required not one second of extra work to fit perfectly in my barrel. Plop, it works.
And when I use it, I don't wipe it off........or ever take an extra second to let it 'warm up', I just stick it in the barrel. It is just a rod stuck partway down into an Igloo personal 12-pack cooler, nothing fancy. When I pull it out, I swab one time with a dry patch, stick the rod back into the ice (which by the time I get to the range is a block of ice and a bunch of cold water), and load up. It works so well it scares me!!!
But I agree with these guys, it ought to be tight enough to do its job........transfer of heat.
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Post by 12ptdroptine on Mar 28, 2009 16:59:11 GMT -5
turned it down a little more today. It slide's in the barrel good now . I can feel it contact while going in but not as much drag on it. I polished it like a mirror so it wouldnt hold anything . I know that it will scar from use but I sure am in hope's it works..I have never been the tatient type..And 15 minute's between shots would be like my mother making me stand in the corner when I was a kid... Drop
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Post by Deleted on Mar 28, 2009 18:02:26 GMT -5
Using a cooling rod along with 12volt air pump makes for 5 minute or less, shots in the summer. 1 minute with the rod, dry it off, then 3-4 min with the modified tire pump. No swab and no condensation. I got a 4' piece of 1/2" aluminum rod at Home Depot and it fit without turning or sanding. I also copied Richard's PVC ice and water holder. I like it.....
Zen
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Post by Harley on Mar 28, 2009 18:21:55 GMT -5
Panhandle, if you're going to introduce a 12v current into the equation you might as well go all the way and build the pump I designed. Cools in less than one minute with no condensation. Check it out in the Tips section.
No, Richard, I'm not pushing it. LOL.
Harley
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Post by Richard on Mar 28, 2009 18:28:21 GMT -5
Harley............I'm not making a dime on it so push whatever you want!  Seriously, the rod is simple and it plain "works!" Richard |
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Post by Deleted on Mar 28, 2009 22:20:30 GMT -5
Panhandle, if you're going to introduce a 12v current into the equation you might as well go all the way and build the pump I designed. Cools in less than one minute with no condensation. Check it out in the Tips section. No, Richard, I'm not pushing it. LOL. Harley Harley When I first saw your model I was tempted believe me.  Zen |
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Seriously, the rod is simple and it plain "works!"