Corner/side alignment guides are typically used on the register punch rather than pin glass, where they're unnecessary. And yes, simply having one hole in the glass a tiny bit oversized would allow the task of precise pin spacing.
Corner/side alignment guides are typically used on the register punch rather than pin glass, where they're unnecessary. And yes, simply having one hole in the glass a tiny bit oversized would allow the task of precise pin spacing.
Durst once had something analogous.
Having now spoken with multiple specialists in both high precision glass cutting & optical glass supply, none of them recommended water cutting for holes of the sort needed, and definitely not in an optical surface (they all made unhappy noises at mention of water cutting of that nature). The latest generations of double sided glass drills can however apparently deliver an excellent hole with no blowout at 3.5mm, which is a reasonable size to make the shank of the off-centre pin compliant with. It's not going to be cheap, but if it allows something close to Condit's elegant and simple solution, then I'll be happy.
Just to double check, were both of the pins in the glass off-centred on their shanks, or just one of them?
I don't see the problem, you may see in many videos how glass is smoothly perforated and smoothly cut: https://www.youtube.com/watch?v=a_qMKKwvzz8 , but if they cant... no problem, if the pin is retained by the metal plating then the glass hole may be larger than the pin:
In my case, cutting the two glasses will be under $20, I often rent that machine for some $200/h, and if you see the videos this can be done in less than 5min.
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This is my reviewed design, the idea is placing a punched sandwich and then tensioning the left plate before tightening the (not shown) bolts, so the good inter pin distance will be adjusted:
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That glass is about 60% thicker & is having a considerably different machining operation done - the thickness of the glass is apparently quite important for successful water cutting & the quantities cut relative to acceptable final pieces is also important. The video mentions neither of these, yet every supplier I've spoken with has taken the time to explain that these are important factors.
More importantly, the design of the punch is far more critical to the success of the whole system than too many moving parts in the pinned glass. You want to be able to permanently lock down the pinned glass to match the punch - thus the epoxy'd in off-centre pins in the Condit approach.
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