Posted by admin | Posted in Gardening Equipment | Posted on 28-07-2009
Tags: electric, etr, limits, speed, variable, variable speed blender, variable speed drives, variable speed electric motor, variable speed motor, variable speed pool pump
How does the Variable Speed on a VSR drill work? Can I cheaply add this feature to my drill press?
The variable speed feature on a hand drill is made with a special kind of device called an SCR or Silicon Controlled Rectifier. Sometimes a more sophisticated SCR called a TRIAC is used. In either case a small voltage controlled by the finger trigger controls a big voltage and current through the SCR.
SCR’s get bigger and more expensive based on the current they have to carry. A Drill press draws a lot more current than a hand drill because it has a larger electric motor. You need a much larger SCR to control it. You can build a speed control but it would be expensive. Better to look for a used VSR or variable speed drive on ebay or a local flea market for industrial goods. VSR’s are used in industry to control big electric motors and generally are rated by horsepower of the electric motor to be controlled. If you know any electricians they also might know someone who has a used one they might part with for cheap.
You probabl;y need a 1 – 5 hp variable speed AC drive. I’ m just guessing how big the motor is on your drill press. You will need to look at the specifications on your motor to match it up with the drive.
Speed control is more than just changing the voltage, the variable speed drive alters current, frequency and voltage to get a smooth linear response to changes in speed.
Best Regards
Adrian Dunevein
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Toro 51599 Ultra 12 amp Variable-Speed Electric Blower/Vacuum with Metal Impeller $64.99 Powerful and effective, the Toro Ultra 3-in-1 Blower, Vacuum, and Leaf Shredder makes completing yard work fun and easy. With air speeds up to 235 mph, this electric blower nevertheless is lighter, quieter, and cleaner than similar gas blowers. And with a sleek, ergonomical design, it’s a tool that is easy to use and will grab your neighbors’ attention. .caption { font-family: Verdana, Helveti… |
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Factory Reconditioned Ryobi ZR08510 25.4cc Gas-Powered Variable-Speed Hand-Held Blower/Vacuum/Mulcher $69.99 This is a factory reconditioned power tool. Reconditioned generally means that the tool has been returned to the manufacturer, who brings the tool back to like new condition. Some tools may contain cosmetic blemishes. Includes 25.4-cc Gas Powered Variable Speed Hand Held Blower/Vacuum/Mulcher – ZR08510, Upper Blower Tube, Sweeper Nozzle, High Velocity Nozzle, Vacuum Handle, Vacuum Handle Knobs, Up… |
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Ohm: The Early Gurus of Electronic Music, 1948-1980 $39.98 Opening with Clara Rockmore’s reworking of Tchaikovsky with the theremin, and finishing with one of Brian Eno’s ambient soundscapes, OHM artfully succeeds in its goal of giving a representative (as opposed to the impossible, comprehensive) overview of the first several decades of electronic music. Over 3 discs, 42 compositions, and 96 pages of notes and photos, OHM clearly illustrates the producer… |
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The 25-Year Retrospective Concert of the Music of John Cage $55.60 Hard to believe that as early as 1958 there was a 25-year retrospective concert of John Cage’s music. But this 3-CD set documents both the concert and its meaning for the history of New Music. Organized by no less than Jasper Johns, Robert Rauschenberg and Emile de Antonio, the event sparked heated controversy–some of it documented in the crowd’s reaction to Cage’s early tape- music piece, Wi… |
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Hugh Le Caine: Compositions & Demonstrations, 1946-1974 $17.64 Hugh Le Caine, early electronic music pioneer, demonstrates his Electronic Sackbut in 1948 by playing the opening clarinet solo from Gershwin’s ‘Rhapsody in Blue’. Working at his Toronto laboratory, supported by the Canadian National Research Council, he went on to engineer and prototype the touch sensitive organ, variable speed recorder, multi-track recorder, and numerous other magnificent elect… |
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Dremel 300-1/24 300 Series Variable-Speed Rotary Tool Kit $47.88 Includes:⢠300 Series Variable Speed Rotary Tool ⢠Circle Cutter Attachment ⢠191 High Speed Cutter ⢠401 Mandrel ⢠402 Mandrel ⢠403 Bristle Brush ⢠407 Coarse 1/2″ Sanding Drum ⢠414 Small Felt Wheels (2) ⢠420 Heavy Duty Emery Cut-Off Wheel (2) ⢠421 Polishing Compound ⢠422 Cone… |
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OneTouch Massage Variable Speed Professional Massager 4X $49.99 -OneTouch Variable Speed Massager- The OneTouch Variable Speed Muscle Massager is a lightweight massage unit that provides soothing muscle relief from stress and tension. The simple-to-use variable speed setting makes giving a massage easy. Our massager will help relieve shoulder, neck, back, thigh, and foot pain. The sturdy, reliable, and maintenance-free hand-held massager has two speedshigh (… |
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Core Jeanie Rub Massager … |
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Variable Speed Electric Drives $78.36 Variable Speed Electric Drives |
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Variable Speed Drives $69.55 Variable Speed Drives |
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Variable Speed Jigsaw $21.9 VS JIGSAW: Economy priced power tool, ideal for DIY. Variable speed, 500-3500 SPM. 3.5A motor. Accepts universal shank blades. Transparent blade guard for safety. Adjustable base tilts 0-45 both directions. Includes 2 blades. UL approved. |
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Orbital and Variable Speed Jigsaw $84.09 3 orbital settings plus straight cutting for use in a variety of materials. Variable speed 500 to 3100 SPM with speed dial to set maximum. 3.9A. Low vibration, low noise design. Sliding dust cover keeps chips from flying and aids in dust collection when connecting port to vacuum. Bevel cuts up to 45 left or right with positive stops at 90. Stroke length 11/16”. Accepts T-shank blades only. Includes: Blade, wrench, and tool case. |
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Electronic Variable Speed Drives $79.65 This one-of-a-kind book gets its distinction from a total commitment to electronic variable speed drives and provides the essential information maintenance technicians need to understand DC and inverter drive technology. Logically structured, Electronic Variable Speed Drives, 3E begins with fundamental drive circuits and builds to an understanding of more complex drive circuits for improved learning. Troubleshooting and maintenance are emphasized throughout, and abundant waveform schematics help guide the reader’s understanding of the theory of operation of the different types of drives and their circuitry. This updated third edition includes two new chapters on digital regenerative DC drives and frequency inverters, as well as the mechanical installation, electrical installation, set-up, tuning, programming, operating, and troubleshooting of each drive. |
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3/8 Variable Speed Reversing Drill $23.18 3/8 VSR DRILL: Economy priced power tool, ideal for DIY. 3/8 variable speed reversing drill with keyed chuck. 4.2A motor. 0-3000 RPM. Variable speed control for a variety of applications. Belt clip. UL approved. |
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Makita 6407 Variable Speed Drill $101.01 64073/8 Drill Variable Speed ReversibleFeatures and Benefits:Powerful 4.9 AMP motor0-2500 RPM no load speedLow decibel rating 79dB for quieter operationAll ball bearing construction for durability and long tool life |
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Broan 57V – Electronic Variable Speed Control $32.82 Broan-NuTone Electonic Variable Speed ControlBroan-NuTone Collection3 Amp Capacity120 VFits Single Gang Box |
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Broan 57W – Electronic Variable Speed Control $32.82 Broan-NuTone Electonic Variable Speed ControlBroan-NuTone Collection3 Amp Capacity120 VFits Single Gang Box |
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3-Channel RC Remote Controller w/ Variable Speed Control (Factory Refurbished) $99 Newest design with variable speed control, speed control in your hand. (Not like other just on or off) ! |
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Makita 3/8 Drill Variable Speed, Reversible $181.21 DP3002Drill 3/8 Variable Speed ReverseFeatures and Benefits:Powerful 7 amp motor for heavy duty industrial performanceVariable speed (0-1 200 RPM)Retractable belt clip allows operation in tight areasSide handle rotates 360 degreesIncludes: Drill chuck chuck key and side handle |
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