Posted By: MI_Custumz
Drilling concrete questions - 10/12/23 11:39 AM
I have a friend who wants me to help install a pool cover for her inground pool. I have a hammer drill, but the capacity says 5/8". We would need to drill a 3/4" hold for the mounting holes. I am not sure if my hammer drill is powerful enough to go from 1/8" to 3/4" from what I have read. But would it be fine if I went up to 3/8" and then do the 3/4" bit? I used 3/8" in my fireplace just fine, but 3/4" is a big jump.
Posted By: Stanton
Re: Drilling concrete questions - 10/12/23 01:28 PM
Buy the bits to go up in 1/8 increments. The drill will likely handle the larger bits - just keep cleaning out the holes - its the dust in the bottom of the holes that will cause the bits to bind.
A better alternative would be to rent the appropriate tool from Home Depot or Lowes.
I'd rather admit I don't own the right tool than ruin the wrong one - I doubt they'd offer to replace it !!
Posted By: 6PakBee
Re: Drilling concrete questions - 10/12/23 02:07 PM
If the SDS shank on the 3/4" bit fits your drill, it'll work. It may be slower than you are used to but it will work. The trick of double drilling a hole in concrete has never worked for me. Drill the size you want, first pass.
Posted By: slantzilla
Re: Drilling concrete questions - 10/12/23 02:36 PM
How deep and how many holes?
Posted By: Beebuzzn
Re: Drilling concrete questions - 10/12/23 03:41 PM
With 3/4” holes and probably 12 or more if fare size pool I would invest in a rotohammer and not chance burning up your hammer drill. A cheap rotohammer from Harbor Freight or Amazon and can be had for around $100. Many also come with bits, though not very good quality but should last through a couple dozen holes if you don’t hit rebar…..Using proper tool for job will go much quicker. My HF rotohammers are 15yrs old and still working, using on a couple jobs a yr. Don’t have to worry about people stealing them also as when I had Hilti…
Posted By: 6PKRTSE
Re: Drilling concrete questions - 10/12/23 04:30 PM
My 30+ year old hand held Milwaukee 1/2" drill has a hammer drill option. I have drilled hundreds of holes with it over the years from 3/8" to 3/4" inch. Step up to the larger sizes as mentioned. It is not as quick to do as using an actually rotary hammer drill, but it gets the job done.
Posted By: ruderunner
Re: Drilling concrete questions - 10/12/23 04:37 PM
Nobody mentioned it but, go all the way through the concrete. Drainage and getting the bolts out later are the concerns.
Posted By: MI_Custumz
Re: Drilling concrete questions - 10/12/23 05:33 PM
Posted By: MI_Custumz
Re: Drilling concrete questions - 10/12/23 05:43 PM
Which one would you go with if I had to get a bigger one? I plan on using the one I have and if it burns up, I will run to Harbor Freight to get a new one. Have a HF like 5 minutes from the house. Rather not spend the money if I don't have to. Not worried if it takes longer with a smaller drill.
https://www.harborfreight.com/power...-variable-speed-rotary-hammer-63443.htmlhttps://www.harborfreight.com/build...-variable-speed-rotary-hammer-58214.html
Posted By: Beebuzzn
Re: Drilling concrete questions - 10/12/23 07:16 PM
This is what I have and just use 3/4” bit or what’s called out. Nice thing about tool like this is it can be used for chipping concrete lightly or busting tile up. It doesn’t hurt to get a tube of epoxy to bed the anchors in also.
https://www.harborfreight.com/10-amp-1-18-in-sds-type-variable-speed-rotary-hammer-64288.html
Posted By: MI_Custumz
Re: Drilling concrete questions - 10/14/23 10:19 AM
I just picked up the last one at the local HF. What grease do you use when the supplied can runs out? Also, what are the two small electrical pieces in the bag with the manual and the rubber boot in the case?
Posted By: 6PakBee
Re: Drilling concrete questions - 10/14/23 01:05 PM
I just picked up the last one at the local HF. What grease do you use when the supplied can runs out? Also, what are the two small electrical pieces in the bag with the manual and the rubber boot in the case?
1)
Grease2) Guessing they are replacement brushes.
Posted By: Moparite
Re: Drilling concrete questions - 10/14/23 05:17 PM
Depending on what anchors you use i would go at least 3 inches down. Typical wedge anchors need some room to catch and expand. If the hole is slightly larger it may not catch or need more space. Also the closer to the surface you run the risk of cracking/chipping off the surface when you tighten it. I have installed plenty of these.
Posted By: MI_Custumz
Re: Drilling concrete questions - 10/15/23 10:47 AM
Depending on what anchors you use i would go at least 3 inches down. Typical wedge anchors need some room to catch and expand. If the hole is slightly larger it may not catch or need more space. Also the closer to the surface you run the risk of cracking/chipping off the surface when you tighten it. I have installed plenty of these.
The pool cover comes with anchors and says to drill down 1 5/8". I have drilled into brick to mount a tv, but that was only 5/8" holes. My old drill was fine for that. The anchors for the pool cover call for 3/4" hole and didn't want to burn up the drill I have so I got a new one.
Posted By: MI_Custumz
Re: Drilling concrete questions - 10/19/23 03:39 PM
Got the pool cover installed. Thanks for all the advice. Was 30 anchors and went smooth with a small hammer drill to do the pilot holes and then the HF one for the final one. Most went in straight, some went in on a bit of an angle, but all in all, we are happy.