Trip59
Cast Iron
- Joined
- Mar 2, 2011
- Location
- Middleburg, Florida, USA
I'm finding myself puzzled. I CAN start cutting and just test fit, but all I learn is that it fits or it doesn't. What I'm after:
I need to make a new retaining ring for the sight glass for my Van Norman. Thanks to Steve Steven, I now know that it's a parallel thread, not an NPT like the sight glasses from MSC/McMaster, etc. which are in abundance. I did some measuring today, it's .3 recessed into the gearbox, subtract the glass thickness, etc. I'm going with .25" thick. 1.5" minor diameter (peak to peak, correct me if it's not the minor diameter). Thread gauge says 20tpi. So, where I'm at:
if I take a 1/4 20 from my charts, subtract the minor diameter from the major diameter, will that be the same number as it would be for this? Are all 20tpi (let's assume the same class) going to have the same thread height? Can I take that number and add it to 1.5 and get a major diameter for single pointing the new piece?
Again, I could try, and it might work, but I would have to try and hope next time instead of knowing how to do it.
Trip
I need to make a new retaining ring for the sight glass for my Van Norman. Thanks to Steve Steven, I now know that it's a parallel thread, not an NPT like the sight glasses from MSC/McMaster, etc. which are in abundance. I did some measuring today, it's .3 recessed into the gearbox, subtract the glass thickness, etc. I'm going with .25" thick. 1.5" minor diameter (peak to peak, correct me if it's not the minor diameter). Thread gauge says 20tpi. So, where I'm at:
if I take a 1/4 20 from my charts, subtract the minor diameter from the major diameter, will that be the same number as it would be for this? Are all 20tpi (let's assume the same class) going to have the same thread height? Can I take that number and add it to 1.5 and get a major diameter for single pointing the new piece?
Again, I could try, and it might work, but I would have to try and hope next time instead of knowing how to do it.
Trip