1. Collect a 100g sample of the shot size to be tested from the machine.
2. The required sieves shall be stacked in ascending order with a pan on the bottom.
3. The 100g sample shall then be poured into the top sieve and the entire stack placed in the Roto-Tap machine and run for 5 MINUTES.
4. Remove the sieves, weigh the samples.
5. Record the results.
Cast Shot Sizes ASR or ASH Cut Wire Sizes AWCR, AWS or AWCH 0.5% Maximum By Weight allowed to Retained on US Sieve Minimum 90% By Weight Retained on US Sieve Ro-Tap Time +/- 5 Seconds
Rotating Speed 275-295 RPM, taps per minute 145-160
ASR / ASH 230 or AWCR / AWCH 28
0.5% Maximum retained allowed on screen 18
90% Minimum retained on screen 30 TAP TIME 5 Minutes
Hope that helps,