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Thread: Pin registration system preferences

  1. #71
    Drew Wiley
    Join Date
    Sep 2008
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    SF Bay area, CA
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    18,338

    Re: Pin registration system preferences

    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.

  2. #72

    Join Date
    Jul 2016
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    4,566

    Re: Pin registration system preferences

    Quote Originally Posted by Drew Wiley View Post
    And yes, simply having one hole in the glass a tiny bit oversized would allow the task of precise pin spacing.
    But in that case two metal platings are necessary, one for each pin, and a guide has to be provided for the floating plating...

    let me draw it...

  3. #73
    Drew Wiley
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    Re: Pin registration system preferences

    Durst once had something analogous.

  4. #74

    Join Date
    Jun 2015
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    Glasgow
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    Re: Pin registration system preferences

    Quote Originally Posted by Pere Casals View Post
    In post 17 I told that I only have cut linear, but in the workshop I order my regular WJ cuts I asked, and I've been shown samples of 1.5mm holes well made on glass, this is the reason why I made my register design with 1.5mm pins.
    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.

    Quote Originally Posted by Drew Wiley View Post
    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.
    Just to double check, were both of the pins in the glass off-centred on their shanks, or just one of them?

  5. #75

    Join Date
    Jul 2016
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    Re: Pin registration system preferences

    Quote Originally Posted by interneg View Post
    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.
    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:

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    Quote Originally Posted by interneg View Post
    It's not going to be cheap,
    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.

    _____________________

    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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  6. #76

    Join Date
    Jun 2015
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    Glasgow
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    Re: Pin registration system preferences

    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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