Need help with Airlock hole/notch sizes and spacing

[snowmonster]

I'm needing the hole/notch sizes and spacing for a Marchon Airlock frame - it's an AL800/53 in a 49 eye size.

I called Marchon and all they did was send a pattern but nothing with any measurements. Their website doesn't have anything terribly useful as well.

Thank you for any help!

[braheem24]

From memory, Large hole is 2.2 spacing is usually 3mm smaller hole is 1.5, I always use a demo or junk lens when I'm not 100% and adjust accordingly.

Hole sizing and spacing should be included in the paper insert with the demo.

[PRECISIONLAB]

Try large hole 4.5 from edge @ 2.2. notch height is 1.15 with width @ 1.25

[Rwhufford]

Hole is 2.2 mm diameter, notch is 1.15mm. Drill the notch .5 to .6 mm from edge and the hole 3.8 mm from notch, or 4.4 from edge.

[Barry Santini]

Interesting to observe the different measurements. Plz keep in mind that they may all "work", but at the nasal side, the effective DBL will vary!

[scriptfiller]

On my Santinelli Less Stress drill I use:
1.0 for the notch, 1.20mm bit
4.70 for the hole 2.20mm bit

Procedure: I drill the notch 1 mm deep, switch bits then drill the hole 4.70 mm deep. I've probably done 1000+ like this.

[snowmonster]

This is perfect - thanks! One more question - is it drilled straight back or perpendicular to the lens surface?

[PRECISIONLAB]

Perpendicular

[scriptfiller]

I typically drill between 3°-5° of tilt dependent on BC.

[becc971]

this thread just totally made my job easier today ... so thanks for everyone who replied with useful info!!!