best type of SDS chisel for backboxes

[crispy_wafer]

Morning all,

 

I need to bash my blocks about 10mm or so I can install backboxes, I've done a handful, chain drilling and then using a wide chisel and a brick hammer to clean up with some success.  But, my wrists are aching, I'm getting bored, and it's taking a long time to do...

 

What's the best type of chisel for my SDS to speed up this task.  I'm happy chain drilling to depth, as I can get my son to do that before I follow him round with the SDS.  

 

 

Thanks

Marek

[Chanmenie]

Multitool is good for this, much quicker than drilling, plus you don’t need to chisel out

Edited August 30 by Chanmenie

[crispy_wafer]

I do use the multi for tidying up the edges, hadnt thought about trying a whole cut out with one though, the blocks are only fibolite blocks, not too hard, but not the softest either, any specific type of blade?  Or just go at it with an old metal or wood bit (I do keep a pile of old ones for the crappy jobs)

[SteamyTea]

I have used one of these in the past, it worked well.

 

https://www.toolstation.com/tct-sds-plus-electricians-box-cutter/p17695

 

[Super_Paulie]

i did a quick final box last night as i missed a AV box when i did them all. SDS drill with 30 or 40mm flat bit went through block like butter, just guide the bit by grasping onto it while it does its thing. I stitch drilled my brick as its solid, but on block just go straight in with the SDS chisel, takes like 5 minutes a box or something.

[Chanmenie]

6 hours ago, crispy_wafer said:

I do use the multi for tidying up the edges, hadnt thought about trying a whole cut out with one though, the blocks are only fibolite blocks, not too hard, but not the softest either, any specific type of blade?  Or just go at it with an old metal or wood bit (I do keep a pile of old ones for the crappy jobs)

I use a carbide tipped blade, but my blocks are pretty soft