Lapping and Polishing Silver (Coin Blanks)
Stage 1 (Diamond polish):
- Kemet 15” lapping/polishing machine
- ASFL polishing cloth
- Kemet Flatness gauge
- 3 micron type k std
- Custom profiled workholder
- Co42 cleaning fluid
Stage 2 (Polish) Equipment used:
- Kemet 15” lapping/polishing machine
- Chem H polishing cloth
- Plastic faced control ring
- Custom profiled workholder
- Col-K S
- Deionized water
| Process Breakdown | ||
|---|---|---|
| Stage | Media | Plate/Cloth |
| 1 | 3 micron type k std | ASFL |
| 2 | Col-K S | Chem H |
Process for Lapping and Polishing Silver
Stage 1: The silver blank was placed inside a custom profiled workholder sitting in a 15” plastic faced control ring on top of a ASFL polishing cloth. The machine was run with 3 micron type k std and cycled for 5 minutes on the rough cut side and 3 minutes on the smooth side. The dispenser settings were 1 second of spray every 40 seconds. The blank was removed and cleaned with Co42.
Stage 2: The diamond polished blank was placed back into the workholder and placed onto a Chem H polishing pad and was run for 5 minutes per side with Col-K S. The blank was immediately sprayed with deionized water after process and air lined off.
Pre-processed blank
Before Lapping Silver
After Polishing Silver
