Finally pulled the gearbox cover plate on my lathe so I could fix the leaking around the gearbox oil sight glass. To my surprise, it's a plastic sight glass that is held in only through an O-ring. Not sure how I want to take care of it, whether tapping for a threaded sight glass using a NPT unit or whatnot. I'm just sure that replacing the O-ring will lead to future leaking in a few years.
Grizzly G9972Z lathe aging
Feb 27, 2010
2 Replies
McMaster has plenty of threaded sight glasses.
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I went there last night, along with Grainger. After satisfying my perfectionist urges, it looks like I'll get new O-rings.
Though a 3/4" x 14 tpi NPT might work in the .982 diameter hole. A bit too big for the starting diameter (about .020) but the fit should be good ofter a eith inch or so.
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