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Tag Archives: polish

Polished PIKANTO hull mould

Monday, December 21, 2009

The PIKANTO moulds were polished first with "Oskar’s buffing and polishing compund M-50" and then with "Norpol Rubbing R-10", both from Terpol (www.terpol.fi) in Turku.

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Shine mould, shine!

Saturday, December 19, 2009

After sanding with 1200-grit and a 10-15um particle-size fine paper it is time for polishing. We have two grades of polishing-compound. These pics show the coarse type which is polished with a spinning soft disk on a power-drill. After polishing follows release agents: first Frekote and then wax. It's still possible we will mould a [...]

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Sunday polishing

Sunday, December 7, 2008

Out pitch-lap is one that really doesn't work when polishing mirror-on-top. Should have realized that yesterday. The first two 20min sessions today were spent making the shape of the mirror worse, before we switched to tool-on-top for the last 30min + 30min. Suddenly it all goes much better, and we are back to a nice [...]

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Polishing continues

Saturday, December 6, 2008

Something must have been wrong with the pitch-lap on Friday, since we began today with a strange bump in the middle of the mirror. The picture shows how the shape of the mirror (actually the wavefront, compared to a sphere) changed through today's polishing session. Slowly getting back to a good spherical shape. Hopefully the [...]

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Polishing and Ronchi testing

Thursday, September 4, 2008

Polishing is hard work compared to fine grinding. There is much more friction between the lap and the mirror - it's nice to take a break after 15 to 20 minutes of polishing. Possibly due to insufficient pressing our mirror started to polish at the outer edge first. We did about 2 hours of polishing [...]

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