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Bridgeport spindle speeds..?

Bellaru433

Aluminum
Joined
Jun 8, 2017
I have a Bridgeport M head milling machine and can’t figure out how to set the machine to the two highest spindle speeds.. on the top scale there are 4 speed settings (275,425,700,1050)
I’m assuming that those are the four different pulley s up top to change..
But on the plate on the front on the belt housing it shows another scale below that that has two more speed settings ..(2100,,4250).. how do I set the machine on those faster speeds..??? There are only 4 pulleys to change the belt on am confused ,,, Again I am new to this and need help from you guys.. thank you very much..
 








 
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