Using win 7, Mach3 Turn, gecko g540 and uc100

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Just starting to use Turn and ran into something I don’t understand (there’s a lot I don’t understand).

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When I issue a G03 command it seems to multiply the feed rate by a factor of ten.?

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g01 f5 x0.325

z0.050

x0.300

g03 x0.200 z0.225 i0.000 k-0.02500 ; just zips around the arc!

g01 z0.275

g0 x0.3625

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Shouldn’t it run at the same feed rate as the G01?

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TIA

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RT