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Posted by hallerb@aol.com on October 7, 2007, 8:13 am
> You are also going to have difficulty making any where near as clean and
> straight hole as with a rotary hammer
>
>
>
>
>
> >> on 10/6/2007 11:48 PM RicodJour said the following:
>
>
> >> >> on 10/6/2007 10:55 PM Steve Barker LT said the following:
>
> >> >>> You need to rent or purchase a good hammer drill. You also may be
> >> >>> encountering rebar.
>
> >> >> No rebar. I'm drilling 3/4" diameter holes 2" deep in a poured
> >> >> concrete
> >> >> sidewalk around my pool. The holes are to attach a mesh winter cover
> >> >> on
> >> >> my inground pool.
> >
> >> >> When I first start the drill, I can see the crushed concrete powder
> >> >> coming out and forming a ridge around the hole. All of a sudden the
> >> >> powder stops building and I can hear the drill bit kinda bouncing over
> >> >> something. The bit never stops turning, it just stops cutting.
> >> >> I wash out the hole and look in. The aggregate filler in this concrete
> >> >> is small roundish pebbles, about the size of a green pea up to a lima
> >> >> bean size with colors of yellow, orange, grey, or whitish. I may see
> >> >> parts of one, or two, or maybe three pebbles intruding in the hole,
> >> >> the
> >> >> tops of which look sanded from the drill rather than cut. At this time
> >> >> I
> >> >> take the small sledge and a 12" long steel tapered flat nosed punch
> >> >> with
> >> >> a 1/4" wide tip and try to crack the pebbles into smaller pieces that
> >> >> the drill bit can handle. I think that the 3/4" hand tool star drill
> >> >> can
> >> >> do a better job of cracking the pebbles with fewer blows since the
> >> >> star
> >> >> drill will completely fill the hole and may crack two or more pebbles
> >> >> with one blow.
>
> >> > The hammer drill (or better yet, rotary hammer) is one of the more
> >> > indispensable tools - there's nothing that works even remotely as
> >> > well. Your question is vaguely akin to someone asking which is the
> >> > best brand of screwdriver to use as a chisel, 'cepting a screwdriver
> >> > is a lot closer to a chisel substitute.
>
> >> I don't see the analogy about using a screwdriver as a chisel when the
> >> hand tool I was asking about is used for the purpose for which it was
> >> made.
>
> > Hence the 'vaguely akin'. I was going to go with the 'asking for help
> > selecting a horse drawn buggy' analogy, but I thought I'd stick to
> > tools.
>
> > Not sure why your Google search turned up dead ends. When I Googled
> > "star drill" it came up with a bunch of hits - Ace Hardware has them
> > and eBay as well.
> >http://www.acehardware.com/sm-dasco-pro-star-drill--pi-1292223.html
> >http://cgi.ebay.com/Enders-3-4-star-drill-and-7-8-long-chisel-used_W0...
>
> > You'll be spending $10 or $20 on something you'll probably never use
> > again and it's going to take you far more time to do the drilling.
> > Your time, your money.
>
> > R- Hide quoted text -
>
> - Show quoted text -
harbor freight sells a hammer drill for 60 bucks bits a little more. a
great price for a occasional need tool.
star drills work but can take hours, hammer drill can do the same job
better in 5 minutes...
plus you have the tool for the next time you need a hole, or have
other jobs. the chisel bit is wonderful, used it once to hrak up a big
rock in my yard when planting some stuff.
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