drilling through concrete fence post

[Marco1976]

Hi,

I would like to insert a 6mm red rawplug in a fence concrete post.

I have this sds drill:
http://www.screwfix.com/prods/36136/Power-Tools/SDS-Drills/Erbauer-6kg-SDS-Drill

Is this suitable for drilling the post? The post has been insitu for quite a few years.

Do you have any suggestion with regards to:

1) drill bit size and make
2) screw size to go in the plug.

I am drilling the holes to attach a batton to the post.

Many thanks

 

[HERTS P&D]

Start with a 6mm masonry bit and work up to 10mm, then fit a 10mm rawl plug. Use coach screws to get a good grip. You can tighten the coach screw with a socket set.

Hope that helps.

And try and not hit the reinforcing bar in the post.

Andy

 

[Nige F]

Hi,

I would like to insert a 6mm red rawplug in a fence concrete post.


1) drill bit size and make
2) screw size to go in the plug.

I am drilling the holes to attach a batton to the post.

Many thanks

1- sure it`s a 6mm ? a lot of reds are 5.5mm any make drill bit 2- No. 10

 

[Marco1976]

yes it is a 5.5 plug. Do you mean i should use m10 screws?
Are these ok for a plug 5.5mm?

How long should the screws be? I am attachinga batton to hold a 0.5mm board on it. I'm not sure i would need something as think as a 2 x4 to go on the concrete post.

 

[JohnD]

I would be very worried about starting a crack in your concrete post. Maybe there is another way? What is this batten for?

 

[RonnyRaygun]

I would be very worried about starting a crack in your concrete post. Maybe there is another way?

Lots of cable ties??

Or metal straps??

 

[Nige F]

yes it is a 5.5 plug. Do you mean i should use m10 screws?
Are these ok for a plug 5.5mm?

How long should the screws be? I am attachinga batton to hold a 0.5mm board on it. I'm not sure i would need something as think as a 2 x4 to go on the concrete post.

Number 10 not M10 1and a half inches long ( M10 is 10mm dia . don`t know where the other poster got that idea that would definitely crack the post. ) Maybe even gripfill the batten on

 

[theSouth]

This is a really old thread but I needed to do this recently.

I tried with SDS bits and made a hole, at the cost of fine cracks in the post. Hmmm...not good.

So I dug out an old 8mm diamond coated tile hollow drill bit (from a recent bathroom build).

Result? Brilliant! Cut like hot knife through butter and because no need for hammer action no cracks in the post. Just a smooth perfect hole that was made using my 18V cordless dewalt. (Ie SDS not required)

You can pick these bits up for around £2 on eBay.

I've not seen these suggested before so thought I'd mention it.

Maybe I'm wrong and everyone knows this though!

 

[Nige F]

Excellent idea- I didn't know you could get diamond drills that small

 

[theSouth]

For example, item 201159703385 from a popular auction site

I used 7mm ones

Cheers

 

[JohnD]

as they're hollow, what do you do with the concrete core while drilling?

Can you snap it off?

 

[theSouth]

Yup. It's so small and brittle it just snaps off as part of the process of drilling in my experience.