Yeah, never use anything but a hammer drill on stone/concrete/etc. On Wednesday, June 3, 2015, Josh Reynolds <j...@spitwspots.com> wrote:
> What you want for the concrete is a rotary hammer. A little spendy and > the bit cost is astronomical, but they will bite through granite like it's > nothing in seconds. We use rotary hammers for rohn wall mount kits going > into brick, concrete, and stone. Have only tried the corded hitachi's, > although dewalt has a cordless one I've been keeping my eye on. > > > http://www.amazon.com/Hitachi-DH40MRY-16-inch-Rotary-Hammer/dp/B000XVINQY/ref=sr_1_4?ie=UTF8&qid=1433378353&sr=8-4&keywords=hitachi+rotary+hammer > is what we've used. > > > http://www.amazon.com/DEWALT-DCH253M2-Mode-Rotary-Hammer/dp/B00DD1UOTU/ref=sr_1_9?ie=UTF8&qid=1433378421&sr=8-9&keywords=dewalt+rotary+hammer > is the one I've had my eye on. > > Josh Reynolds > CIO, SPITwSPOTSwww.spitwspots.com > > On 06/03/2015 02:37 PM, Jaime Solorza wrote: > > We are trying different brands for 3/32 holes we need for door contacts > and switches. Metal is tough then we hit concrete on door frame. Slow > speeds and oil helps but we eat them up. For concrete and cinder block > walls Hilti drill and bits have no problem. > > Jaime Solorza > On Jun 3, 2015 4:26 PM, "Chuck McCown" <ch...@wbmfg.com > <javascript:_e(%7B%7D,'cvml','ch...@wbmfg.com');>> wrote: > >> You can do it by hand with a bit of practice. >> >> *From:* Glen Waldrop >> <javascript:_e(%7B%7D,'cvml','gwl...@cngwireless.net');> >> *Sent:* Wednesday, June 03, 2015 4:24 PM >> *To:* af@afmug.com <javascript:_e(%7B%7D,'cvml','af@afmug.com');> >> *Subject:* Re: [AFMUG] Sharpening Drill Bits >> >> My dad has always sharpened his own, so I tend to do the same. >> >> In my experience, if used in wood they can be sharpened with little >> issue. If you drill through metal, buy a new one. >> >> It loses some of the hardness on the edge. It really needs to be tempered >> again after sharpening. >> >> >> >> ----- Original Message ----- >> *From:* Rory Conaway >> <javascript:_e(%7B%7D,'cvml','r...@triadwireless.net');> >> *To:* af@afmug.com <javascript:_e(%7B%7D,'cvml','af@afmug.com');> >> *Sent:* Wednesday, June 03, 2015 5:18 PM >> *Subject:* [AFMUG] Sharpening Drill Bits >> >> >> We are paying $15-$25 for longer drill bits. When they start to get >> dull, just wondering if anyone has had success sharpening them or do you >> just buy new ones? >> >> >> >> *Rory Conaway **• Triad Wireless •** CEO* >> >> *4226 S. 37th Street • Phoenix • AZ 85040* >> >> *602-426-0542 <602-426-0542>* >> >> *r...@triadwireless.net >> <javascript:_e(%7B%7D,'cvml','r...@triadwireless.net');>* >> >> *www.triadwireless.net <http://www.triadwireless.net>* >> >> >> >> *“You may be an engineer if your idea of good interpersonal communication >> means getting the decimal point in the right place.” – Unknown* >> >> >> >> >
