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Post by sncf141r on Dec 17, 2013 2:32:52 GMT
View Attachmentif i could grind the ends of the 5/16" dia pyrex tube accurately i reckon i could make the body much smaller as on mine the 'O' rings go around the glass. the body has recesses carefully made in it for the 'O' rings. Julian; Just read of someone using a "wet tile cutter" with carbide blade to cut gauge glass. (was on the www.chaski.com forum) I do have one of these, with spare carbide blade, but permanently lent out to a brother-in-law. You know the kind of ceramic tile cutter; looks like a table saw, but has a slower turning blade, in a water bath. That might help cut the tube more accurately - what do you think? Another JohnS.
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Post by Roger on Dec 18, 2013 12:59:32 GMT
I suppose you could use a tile saw to get it roughly the right length and then gingerly use one of those tile files as a lathe tool to tidy it up. I must say the thought of doing anything that involves abrasives on the lathe fills me with horror though. I'm lucky enough to have a Jones & Shipman tool and cutter grinder with a diamond wheel so I don't have to do that sort of thing. Maybe you know someone with a quorn cutter grinder that you could use?
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jma1009
Elder Statesman
Posts: 5,913
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Post by jma1009 on Dec 18, 2013 21:38:37 GMT
i have watched quite a few youtube clips about cutting glass pyrex tube the last couple of days! i wasnt aware of youtube till my kiddies mentioned it about 2008/9, after the above sight glass had been made. it is amazing what one learns off youtube etc and also via the excellent help and advice from fellow contributors here! my previous sight glasses have been made via the 'nick on the glass' method then snapping off as per water gauges, hence the uneven ends unsuitable for 'O' rings fitted on the ends, though as i'd made up a few special tools for making recesses for same if fitted around the glass i wasnt unduly worried. anyway, thanks to both JohnS and Roger for their advice! the pic of the sight glass i'd made and tested is 1/2" dia OD of the brass fitting - if the glass is end sealed i reckon i can get this down to 7/16" if not less. cheers, julian
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Post by Shawki Shlemon on Dec 19, 2013 9:05:16 GMT
I must have cut a lot of glass tubes over the last 30 years or so , many years ago I got a piece of timber and cut a V groove in it , I hold it in a vice and rest the glass tube on it marked where to cut , using a triangle file ( I keep one new for the purpose ) cut a groove on the marked line all the way around the tube then snap it by hand , every time nice and square clean cut , never had a problem , then light finish the cut surface on the linisher or with wet and dry on flat surface .
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Post by Deleted on Dec 19, 2013 13:03:16 GMT
Hello JULIAN,..Nice gauge-------- I'm also VERY impressed with that fine milling / etching work on your "Replica" £1 coin !!(Christmas Joke!!)
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Post by Roger on Dec 19, 2013 20:55:09 GMT
Just one more thought on finishing the ends. You could always hold the glass in the pillar drill, protected with paper, then bring the end down onto an abrasive. The ones that spring to mind are those sticks you use to true offhand grinding wheels if there's a lot to be tided up, down to slip stones or even those diamond faced hone files they sell for sharpening chisels.
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