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#1
Posted to rec.woodworking
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Reducing drill press speed further
I have a Delta Shopmaster Drill press. I would like to reduce the speed
from 610 min to about 300 min rpm. Since this is basically an entry level model my options are limited. I am not concerned about the longevity of the motor. Can a variostat be safely used to reduce speed? This modification would prolong the need to upgrade models. The reason I need a slower speed is to run a circle cutting tool from general to cut neoprene gasket material. 500 rpm is max speed for this tool. |
#2
Posted to rec.woodworking
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Reducing drill press speed further
Using a Variac to reduce voltage/speed will cause the motor to overheat
rather quickly. Optional methods would be to change a pulley, mount another motor externally and use the existing motor pulley as the intermediate pulley to double-step reduction, change the motor to DC and use the Variac (with a bridge rectifier) to adjust speed or finally go to a three phase motor and a VFD. Temporarily mounting another motor shouldn't be too bad a method, especially if you already have something useable. Respectfully, Ron Moore "Drew_Y" wrote in message oups.com... I have a Delta Shopmaster Drill press. I would like to reduce the speed from 610 min to about 300 min rpm. Since this is basically an entry level model my options are limited. I am not concerned about the longevity of the motor. Can a variostat be safely used to reduce speed? This modification would prolong the need to upgrade models. The reason I need a slower speed is to run a circle cutting tool from general to cut neoprene gasket material. 500 rpm is max speed for this tool. |
#3
Posted to rec.woodworking
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Reducing drill press speed further
I have a Delta Shopmaster Drill press. I would like to reduce the speed from 610 min to about 300 min rpm. Since this is basically an entry level model my options are limited. I am not concerned about the longevity of the motor. Can a variostat be safely used to reduce speed? This modification would prolong the need to upgrade models. The reason I need a slower speed is to run a circle cutting tool from general to cut neoprene gasket material. 500 rpm is max speed for this tool. Other ideas, I've got this mini chinky cheezy 4"/8" "pos" I bought new for $40... I thought of the same when I wanted to use it for sharpening with my own made "wheel strop". Not to mention the required speeds for forstner bits. Went through much of this yakking in this ng (of which I appreciate all the help), larger pullies, it takes a huge pully that is much too big, like 17" or so (definitely "too big"), as a direct connection from the drive pully. There is another method that takes rebuilding it to a permanent slow speed using a mandrel mounted down the side with a large pully down below... that is rediculous, at least for me. DC motor and speed control? it would work, but maybe $200 for that so, may as well buy the new DP. Finally, looking at other DP's with more speeds I decided that adding a third central step pully and belt is the best idea, as Ron mentions. It would take minor machining of drilling and thread tapping into the body to do it, then adding the spindle and pully. You might need link belting for the abnormal distance. The hell with it for now... I'll buy a new one. -- Alex - "newbie_neander" woodworker cravdraa_at-yahoo_dot-com not my site: http://www.e-sword.net/ |
#4
Posted to rec.woodworking
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Reducing drill press speed further
I realize this is not responsive to your question but.....IMNO circle
cutters are very highly overated. I doubt you will have much luck cutting neoprene with one anyways. How about finding something the correct diameter and sharpening it enough to turn it into a crude die cutter. I have done this using tin cans, tube and pipe. The only way to control the speed of an induction motor is with a frequency changer. Dave |
#5
Posted to rec.woodworking
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Reducing drill press speed further
Thanks for everyones help.
I knew a variostat would be abusive to the motor, but if I am only making 25 at a time and then taking it off, I think it is livable. By the time I modify the DP I already overspent the initial cost easily with the possiblity of now liking the modifications. I think for another hundred I can buy a new one that does the job already. I already made a jig to cut the neoprene sheeting that I am satisfied with. I would not use this tool to cut more than 1/8" deep. I wood definately agree more than this thickness a punch would be better, but I would need two of them custom made for the tolerances I want. I tried using a linoleum knife around a wood template but it ended up looking like a item made in a garage. Drew |
#6
Posted to rec.woodworking
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Reducing drill press speed further
Drew_Y wrote:
I have a Delta Shopmaster Drill press. I would like to reduce the speed from 610 min to about 300 min rpm. Since this is basically an entry level model my options are limited. I am not concerned about the longevity of the motor. Can a variostat be safely used to reduce speed? This modification would prolong the need to upgrade models. The reason I need a slower speed is to run a circle cutting tool from general to cut neoprene gasket material. 500 rpm is max speed for this tool. What I would do is find a very similar delta model that has a variable speed motor control. Then get a schematic to see how its wired in, then mimic that on your setup. In all likely hood its the same motor. If its not the same motor you will likely see it in the schematic. -- Thank you, "Then said I, Wisdom [is] better than strength: nevertheless the poor man's wisdom [is] despised, and his words are not heard." Ecclesiastes 9:16 |
#7
Posted to rec.woodworking
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Reducing drill press speed further
On 8 Feb 2006 19:53:58 -0800, "Drew_Y" wrote:
I have a Delta Shopmaster Drill press. I would like to reduce the speed from 610 min to about 300 min rpm. Since this is basically an entry level model my options are limited. I am not concerned about the longevity of the motor. Can a variostat be safely used to reduce speed? This modification would prolong the need to upgrade models. The reason I need a slower speed is to run a circle cutting tool from general to cut neoprene gasket material. 500 rpm is max speed for this tool. Replace the pulley or get a hole saw to run at 610 rpm. Circle cutters can be scary--practice safety! |
#8
Posted to rec.woodworking
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Reducing drill press speed further
Circle cutters work great. First thing to do, however, is to get rid of (or
just regrind) the factory cutter. The shape they come ground, they can't work worth a crap. "Dave W" wrote in message ... I realize this is not responsive to your question but.....IMNO circle cutters are very highly overated. I doubt you will have much luck cutting neoprene with one anyways. How about finding something the correct diameter and sharpening it enough to turn it into a crude die cutter. I have done this using tin cans, tube and pipe. The only way to control the speed of an induction motor is with a frequency changer. Dave |
#9
Posted to rec.woodworking
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Reducing drill press speed further
Circle cutter is not a great tool after using it a while. To cut gasket
material I used a leather punch set to cut bolt holes and circle cuttuer only to trace a line around abouth 1/32nd deep. I then use surgical scissors to finish the cut. I fully agree the way this cutter was shipped is not great for delicate cuts at all. I would much rather have a 6" punch to do the hole job. |
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