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25598

Re: stuck pitch lap is free

Hi Rick, Your welcome and very glad this method worked for you. Good luck in completing your mirror once your able to resume working on it. John From:
John Vogt
Jul 22
#25598
 
25597

Re: stuck pitch lap is free

Glad the woodworkers' clamp worked. It is more commonly used to separate mirror and grinding tool when the grit was fined out too much and the combination with
paul valleli
Jul 22
#25597
 
25596

Re: stuck pitch lap is free

Thx for letting us know - the glass will wait if need be! Some of my glass has waited years... Mel Bartels
Mel_Bartels
Jul 21
#25596
 
25595

stuck pitch lap is free

Hi All, Sorry for the delay, lots of sad things going on in my life at the moment. Today I had a few moments to attempt unsticking the lap and glass and as per
optical_stargazer
Jul 21
#25595
 
25594

stuck pitch lap

Rick M; Mel Bartels has described the safest method of separation - freezing the pitch overnight in a freezer - 0 deg. F is fine. The colder the pitch is, the
paul valleli
Jul 20
#25594
 
25593

Re: stuck pitch lap

... Mark If you are not able to disconnect the aluminum disk from the machine, place a warm-hot air blower facing the pyrex (Pyrex can take the heat or cold
Pete DeBaan
Jul 20
#25593
 
25592

Re: stuck pitch lap

Clamp with pressure is best idea... Try to get water to seep between... Mel Bartels
Mel_Bartels
Jul 20
#25592
 
25591

Re: stuck pitch lap

The aluminum disk was attached to the polishing machine, the mirror blank is a full thickness Pyrex disk. Not a chance of breaking it with careful aimed blows
petemn2004
Jul 20
#25591
 
25590

Re: stuck pitch lap

... ouch! TTBOMK, one should never pound on the mirror... always attack the tool... -- NOTE: No off-list assistance is given without prior approval. *Please
waldo kitty
Jul 20
#25590
 
25589

Re: stuck pitch lap

I recently pressed in a 12.5 mirror after widening the channels in the full size pitch lap (on an aluminum disk). I left the mirror on top of the pitch lap for
petemn2004
Jul 20
#25589
 
25588
radicell2
Jul 20
#25588
 
25587

Re: stuck pitch lap

Rick, I have used towing strap (polypropylene webbing type) around edge of the bottom disk to hold it in place, similar to a sling mirror cell. These straps
Jerry
Jul 19
#25587
 
25586

Re: stuck pitch lap

Check out this thread from cloudynights, particularly my suggestion about the wood/pipe clamps originally described in ATM1:
John Vogt
Jul 19
#25586
 
25585

Re: stuck pitch lap

I have been able to free a stuck pitch lap by running hot water over it for a couple minutes. The truth is in the starlight. Dan Croskrey, NV2Z Otis Orchards,
Dan Croskrey
Jul 19
#25585
 
25584

Re: stuck pitch lap

Do you have a freezer big enough? Put the stuck mess in there and after a few hours you can separate with a hard rubber mallet (only striking the tool).
Mel_Bartels
Jul 19
#25584
 
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