Jimmy Two-Jacks Posted June 21, 2009 Share Posted June 21, 2009 Hi, Just been messing around with my pillar drill and I am wondering if any aftermarket gear pulleys are available to bring the speed down. Its an ancient Nutool with a gec motor with a rather too fast low speed of 630rpm. Cheers Quote Link to comment Share on other sites More sharing options...
integerspin Posted June 22, 2009 Share Posted June 22, 2009 VFD and a 3phase motor. Quote Link to comment Share on other sites More sharing options...
Les Henson Posted June 22, 2009 Share Posted June 22, 2009 I have a 1974 Startrite Mercury pillar drill with the 3-phase motor still fitted. The whole thing is run by an inverter and I use that to control the chuck speed. I can turn it right down to just a few rpm if necessary. Les. Quote Link to comment Share on other sites More sharing options...
Jimmy Two-Jacks Posted June 22, 2009 Author Share Posted June 22, 2009 I have a 1974 Startrite Mercury pillar drill with the 3-phase motor still fitted. The whole thing is run by an inverter and I use that to control the chuck speed. I can turn it right down to just a few rpm if necessary.Les. Thanks, I had a rather more low-tec idea come to me today, perhaps it would be possible to invert one of the pulley cones on the spindle to get a favourable gearing cone to cone so to speak, as they are held on with a hex grub screw that will still secure the cone if the pulley is inverted and the pulley is "v" shaped and so the belt shouldnt come off the cone. Any thoughts as a quick fix????? Quote Link to comment Share on other sites More sharing options...
Astro_Al Posted June 22, 2009 Share Posted June 22, 2009 But they already gear it down - inverting one would make it geared 1:1 or worse still, gear it up! You can buy a third pullet set/ cone and mount it on a bracket as an intermediate. The problem with that being the torque sometimes overcomes the belt friction. thats why lower speed drills have geared heads - even if its half geared and half belts/cones, like one of mine, the secondary speed reduction is always gears to cope with the torque. Al. Quote Link to comment Share on other sites More sharing options...
Jimmy Two-Jacks Posted June 22, 2009 Author Share Posted June 22, 2009 But they already gear it down - inverting one would make it geared 1:1 or worse still, gear it up!You can buy a third pullet set/ cone and mount it on a bracket as an intermediate. The problem with that being the torque sometimes overcomes the belt friction. thats why lower speed drills have geared heads - even if its half geared and half belts/cones, like one of mine, the secondary speed reduction is always gears to cope with the torque. Al. Perhaps it is Variable frequency drive alternative then!!! Thanks James Quote Link to comment Share on other sites More sharing options...
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