Originally Posted by
brent stanley
Hi Mark, a couple of things. The head is actually 125 mm in diameter, which might change the math a little bit if you use the spreadsheet (not much) , but what's important is that the critical diameter is the cutting circle diameter with the knives installed. So that's 125mm with just the little carbide rebate knives, but a lot more with HSS knives installed. You'd have to measure, but you're probably in the 165mm to 175mm range.
The RPM ranges for your machine are very strange. I think what MiniMax did was make it work well for European 50hz power (those RPMS are more typical) but instead of making new pulleys/motors for North American markets, they just used the same motor/pulley arrangement and allowed the RPMs to crank up and be kinda useless. The RPM range for that head are very typical of what you see, and if your machine had the 7000 RPM option, it would be right smack in the middle of the chart.
B