How efficient is a cordless drill?
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From: John Doe on 11 Aug 2010 23:53 jimp specsol.spam.sux.com wrote: > John Doe <jdoe usenetlove.invalid> wrote: >> jimp specsol.spam.sux.com wrote: >>> Though one does wonder what you think is special about a >>> cordless drill as opposed to any other kind. >> >> I have two or three spare 36V Bosch cordless hammer drills. > > That's nice but doesn't answer the question. Why do you think that I think a cordless drill is special, Gimp? -- > > > -- > Jim Pennino > > Remove .spam.sux to reply. > > Path: news.astraweb.com!border2.newsrouter.astraweb.com!news-out.octanews.net!indigo.octanews.net!news.glorb.com!feeder.erje.net!news.mixmin.net!aioe.org!not-for-mail > From: jimp specsol.spam.sux.com > Newsgroups: sci.physics > Subject: Re: How efficient is a cordless drill? > Date: Thu, 12 Aug 2010 00:14:46 -0000 > Organization: Aioe.org NNTP Server > Lines: 15 > Message-ID: <m0rbj7-b48.ln1 mail.specsol.com> > References: <4c62fbb4$0$16679$c3e8da3 news.astraweb.com> <77cbj7-bd6.ln1 mail.specsol.com> <4c632224$0$21262$c3e8da3 news.astraweb.com> > NNTP-Posting-Host: 5FQzpG9PgxCHgWX2ynv4yg.user.speranza.aioe.org > X-Complaints-To: abuse aioe.org > User-Agent: tin/1.8.3-20070201 ("Scotasay") (UNIX) (SunOS/5.10 (i86pc)) > X-Notice: Filtered by postfilter v. 0.8.2 >
From: Sam Wormley on 12 Aug 2010 00:02 On 8/11/10 2:36 PM, John Doe wrote: > Asking for a wild guess. How much power is lost between the motor > and the chuck of a cordless drill? How much power is lost in the > gearing? In other words... If you were to use the motor alone to > directly drive something (fast), how much more efficient would > that be than keeping the whole drill together and driving that > something through the chuck (slowly)? > > Thanks. See: http://en.wikipedia.org/wiki/Drill "The hammer drill is similar to a standard electric drill, with the exception that it is provided with a hammer action for drilling masonry. The hammer action may be engaged or disengaged as required. Most electric hammer drills are rated (input power) at between 600 and 1100 watts. The efficiency is usually 50-60% i.e. 1000 watts of input is converted into 500-600 watts of output (rotation of the drill and hammering action)". Just ignore cranks and trolls
From: jimp on 12 Aug 2010 01:12 Sam Wormley <swormley1(a)gmail.com> wrote: > On 8/11/10 2:36 PM, John Doe wrote: >> Asking for a wild guess. How much power is lost between the motor >> and the chuck of a cordless drill? How much power is lost in the >> gearing? In other words... If you were to use the motor alone to >> directly drive something (fast), how much more efficient would >> that be than keeping the whole drill together and driving that >> something through the chuck (slowly)? >> >> Thanks. > > See: http://en.wikipedia.org/wiki/Drill > > "The hammer drill is similar to a standard electric drill, with the > exception that it is provided with a hammer action for drilling masonry. > The hammer action may be engaged or disengaged as required. Most > electric hammer drills are rated (input power) at between 600 and 1100 > watts. The efficiency is usually 50-60% i.e. 1000 watts of input is > converted into 500-600 watts of output (rotation of the drill and > hammering action)". > > Just ignore cranks and trolls And just where do you see the word "hammer" in the original post? -- Jim Pennino Remove .spam.sux to reply.
From: Benj on 12 Aug 2010 15:12 On Aug 12, 8:40 am, jmfbahciv <See.ab...(a)aol.com> wrote: > I'm always surprised at the power they have. For some strange reason, > I don't expect the battery to supply enough juice for all that power > for a long time. > > But then, I never understood torque either. > > /BAH Well that is obvious. What you mean is you never understood all the TORQUE they have. Torque is the amount of force applied to rotate the bit. Power is the amount of energy supplied per a given time. You are surprised that a drill can develop all that twisting ability, not especially at how much energy per second (watts) are coming out of the battery. In fact you are surprised that a so little power (watts) can develop so much force (torque). The answer is based in a device called a lever.
From: Androcles on 12 Aug 2010 15:38
"Benj" <bjacoby(a)iwaynet.net> wrote in message news:09516a48-1f56-4fc5-b2e7-55b3df850d9a(a)w30g2000yqw.googlegroups.com... On Aug 12, 8:40 am, jmfbahciv <See.ab...(a)aol.com> wrote: > I'm always surprised at the power they have. For some strange reason, > I don't expect the battery to supply enough juice for all that power > for a long time. > > But then, I never understood torque either. > > /BAH Well that is obvious. What you mean is you never understood all the TORQUE they have. Torque is the amount of force applied to rotate the bit. Power is the amount of energy supplied per a given time. You are surprised that a drill can develop all that twisting ability, not especially at how much energy per second (watts) are coming out of the battery. In fact you are surprised that a so little power (watts) can develop so much force (torque). The answer is based in a device called a lever. ============================================ A gearbox does wonders for torque, a gear being a 360 degree lever. http://www.etotheipiplusone.net/pics/meche/007/007_19.jpg http://www.robotpower.com/images/cm-80_gears-sm.jpg |