Forums

Cordless corded tools?

Started by John Doe November 21, 2011
On Nov 24, 6:55=A0am, legg <l...@nospam.magma.ca> wrote:
> On Wed, 23 Nov 2011 17:42:36 -0500, cl...@snyder.on.ca wrote: > >On Wed, 23 Nov 2011 09:23:04 -0500, legg <l...@nospam.magma.ca> wrote: > > >>On Mon, 21 Nov 2011 19:54:28 -0500, cl...@snyder.on.ca wrote: > > >>>On Mon, 21 Nov 2011 16:28:52 -0800 (PST), Too_Many_Tools > >>><too_many_to...@yahoo.com> wrote: > > >><snip> > > >>>>Removing the battery pack lightens the tool and many times improves > >>>>the balance. > > >>>>I also have converted a number of 24v cordless tools to belt > >>>>packs...making them easily used above one's head for hours at a time. > > >>>>TMT > >>> 7.2 volt drills, run on 12 volts, work great for drilling nominal > >>>1/8" holes for rivets in aluminum. Several friends have built entire > >>>Zenith (zenair) 701 planes with them. > > >>You might want to consider adding snubbers or clamps to the switch and > >>harness, at the motor. The harness may also radiate. > > >>RL > >RADIATE? =A0If you are worried about AM radio interference throw a > >ferrite torroid on the cord at the rool end. If your worried about > >something else, don't be - because it is NOT a problem. > > That would depend on the control circuitry and motor combination used > by the tool, and the voltage of the substitute battery used. There can > be considerable di/dt, normally handled by the local battery's > placement. Stick the battery at the end of a cable, you'll get more > than just DC cable losses - there will be voltage spikes at the load, > voltage ripple on the controller supply, and rdiation from the > interconnection. > > I'm not worried. It's not my tool, but you don't paint just one side > of a fence. > > It IS becoming increasingly difficult to get clean and stable FM > broadcast reception - never mind AM - particularly from smaller or > distant stations. > > I expect there are similar problems over the rest of the spectrum - > with effects not so easily identifiable by the victim. The perpetrator > is, inevitably, ignorant of them. > > RL- Hide quoted text - > > - Show quoted text -
Actually this brings up a good point...do manufacturers of cordless tools worry about RF interference? TMT
On Thu, 24 Nov 2011 11:15:44 -0800 (PST), Too_Many_Tools
<too_many_tools@yahoo.com> wrote:

>On Nov 24, 6:55&nbsp;am, legg <l...@nospam.magma.ca> wrote: >> On Wed, 23 Nov 2011 17:42:36 -0500, cl...@snyder.on.ca wrote: >> >On Wed, 23 Nov 2011 09:23:04 -0500, legg <l...@nospam.magma.ca> wrote: >> >> >>On Mon, 21 Nov 2011 19:54:28 -0500, cl...@snyder.on.ca wrote: >> >> >>>On Mon, 21 Nov 2011 16:28:52 -0800 (PST), Too_Many_Tools >> >>><too_many_to...@yahoo.com> wrote: >> >> >><snip> >> >> >>>>Removing the battery pack lightens the tool and many times improves >> >>>>the balance. >> >> >>>>I also have converted a number of 24v cordless tools to belt >> >>>>packs...making them easily used above one's head for hours at a time. >> >> >>>>TMT >> >>> 7.2 volt drills, run on 12 volts, work great for drilling nominal >> >>>1/8" holes for rivets in aluminum. Several friends have built entire >> >>>Zenith (zenair) 701 planes with them. >> >> >>You might want to consider adding snubbers or clamps to the switch and >> >>harness, at the motor. The harness may also radiate. >> >> >>RL >> >RADIATE? &nbsp;If you are worried about AM radio interference throw a >> >ferrite torroid on the cord at the rool end. If your worried about >> >something else, don't be - because it is NOT a problem. >> >> That would depend on the control circuitry and motor combination used >> by the tool, and the voltage of the substitute battery used. There can >> be considerable di/dt, normally handled by the local battery's >> placement. Stick the battery at the end of a cable, you'll get more >> than just DC cable losses - there will be voltage spikes at the load, >> voltage ripple on the controller supply, and rdiation from the >> interconnection. >> >> I'm not worried. It's not my tool, but you don't paint just one side >> of a fence. >> >> It IS becoming increasingly difficult to get clean and stable FM >> broadcast reception - never mind AM - particularly from smaller or >> distant stations. >> >> I expect there are similar problems over the rest of the spectrum - >> with effects not so easily identifiable by the victim. The perpetrator >> is, inevitably, ignorant of them. >> >> RL- Hide quoted text - >> >> - Show quoted text - > >Actually this brings up a good point...do manufacturers of cordless >tools worry about RF interference? > >TMT
12 to 24 volt battery operated tools do not "broadcast" very far - either from the brushes or the PWM controllers. Cheap Chinese line operated power tools are another story altogether.