Bubble in pitch
Posted 11 February 2013 - 07:29 AM
Can i use carborundum stone to level all those 4 bubble to make it flat surface?
Thanks in advance
Posted 11 February 2013 - 07:57 AM
Trim the bubbles with a knife or razor blade, then press the lap with your mirror as normal.
Posted 11 February 2013 - 03:54 PM
For those BIG ones, you can slightly heat up some pitch until it is like warm taffy and won't hurt your hands and stuff a wad into your lap so it is slightly higher than the general curve of the lap.
Gently hot press, (I like to think of it as "warm" pressing), and the bubbles will fill in to the level of your lap. There may be a round seam, but after an hour of polishing, you might have a very hard time trying to see it.
Try it and see!
Posted 11 February 2013 - 04:58 PM
If these bubbles are solid, you've got something in your pitch that doesn't belong there, but this is very unlikely to happen.
Posted 11 February 2013 - 11:51 PM
Posted 12 February 2013 - 07:40 AM
Posted 12 February 2013 - 12:42 PM
How big are the holes? A picture would help.
Not a big problem, fill them up with a tiny bit of pitch and do a worm press untill the surface is even and you're ready to polish. Anyway you'll discover as you polish that the lap will get thinner after so much pressing and channel recutting so the small holes will disappear.
Posted 12 February 2013 - 10:41 PM
Here is a link to a pitch lap making tutorial
Posted 12 February 2013 - 11:37 PM