This is a report on the maintenance work done to the Rabbit Laser on March 7, 2018 by Don Smeller.
Complaint was: unable to perform z-0 operation.

1. The screw has fallen out. Lost; looked in tray, didn't find.

Note that nozzle is lower than lowest point on plunger assembly. The nozzle touches first during z-0 operation and crashes the machine.

Note position of cross screw. This is correct position. .

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2. Replaced screw. Secured with nail polish. DON'T MESS WITH THIS SCREW.

Note that bottom of screw is lowest point on plunger assembly. This touches first during z-0 operation, as it should.

Also note position of cross screw. This is incorrect position.

The switch is already actuated when the plunger is in this position. BAD.

Plunger needs to be rotated to position as in picture above.

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3. The nozzle is crudded up. Scrapped clean.

Suspect that cut edges of work piece are ragged instead of smooth as a result of this crud build-up.

Similar crud was on the pointer laser; simply scraping the crud off returned the pointer laser to working again.

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4. The lens has a crack = brown vertical line from near center to 11 O'Clock. Ordered 2 new lens and mirror kits.

Not sure what effect this has on performance, but it can't be good.

Reassembled unit with cracked lens. Concave side down. Gasket below.

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