SDS mason drill bit extension

[Tunajoe]

I've looked all over to no avail.
I have a rock wall I'm trying to drill thru and I need an extension

 

[dutchgray]

Get a longer bit, up to a metre is commonly available. I dont think extensions exist for SDS.

 

[Milton Shaw]

There has been an 82" SDS extension on criags list here in Knoxville Tn for months. I don't know if that is what you are looking for on not. I would just look for a longer bit.

 

[purplezr2]

SDS plus, or SDS max?

 

[kctyphoon]

That’s like a 25 or $30 bit.. new

 

[Nineeightyone]

Could someone explain to me the reason for the SDS design, vs a traditional bit shank (I think that's the correct term)? Using my soon-to-be father-in-law's hammer drill with SDS bits seems frustrating in comparison to my buddy's Dewalt hammer drill that takes standard shank bits.

If it makes any difference, I'm putting holes in the block walls of my garage for mounting pegboard and the like, nothing super heavy duty. Generally 3/16" holes for 1/4" Tapcons.

 

[finn]

Could someone explain to me the reason for the SDS design, vs a traditional bit shank (I think that's the correct term)? Using my soon-to-be father-in-law's hammer drill with SDS bits seems frustrating in comparison to my buddy's Dewalt hammer drill that takes standard shank bits.

If it makes any difference, I'm putting holes in the block walls of my garage for mounting pegboard and the like, nothing super heavy duty. Generally 3/16" holes for 1/4" Tapcons.

My experience is contrary to yours.

Dewalt SDS goes through concrete floors like a hot knife through butter, even with a 3/4” bit, where a regular hammer drill struggles.

Are your SDS bits sharp, and do you have the drill properly set up, ie hammer
drill vs drill only or hammer only?

Looking at the bit design of the SDS, it seems the drill motor pounds on the back of the bit, which is free to slide in the collar, and the rotary motion is transferred through the flutes or grooves on the bit shank. The thrust is thus decoupled from the mass of the drill motor., more effectively transferring force to the bit tip.

 

[Nineeightyone]

My experience is contrary to yours.

Dewalt SDS goes through concrete floors like a hot knife through butter, even with a 3/4” bit, where a regular hammer drill struggles.

Are your SDS bits sharp, and do you have the drill properly set up, ie hammer
drill vs drill only or hammer only?

Looking at the bit design of the SDS, it seems the drill motor pounds on the back of the bit, which is free to slide in the collar, and the rotary motion is transferred through the flutes or grooves on the bit shank. The thrust is thus decoupled from the mass of the drill motor., more effectively transferring force to the bit tip.

I bought a brand new Bosch SDS bit to start my project, though it seems like it's on the dull side now and they're cheap enough that I can purchase another one.

My issue is more I feel the "standard" drill bit shanks are far easier to engage, where I've had issues with my FIL's drill not holding bits in place properly.

 

[kctyphoon]

If the sds bits are not being held, chances are they are not engaged correctly. Sds / sds plus are a quick Chuck design. They engage in a way that makes the bits IMPOSSIBLE to slip inside the Chuck. That's why those drills have clutches - so you dont break your wrist or punch yourself in the face if you hit something like a piece of rebarb. Under no circumstances (virtually) should a normal hammer drill, drill faster than an sds plus rotary hammer. Unless you're drilling through really soft concrete, I can see the higher rpms of a hammer drill drilling faster on a really small hole, but that's about it.

 

[Kev442]

SDS is so much faster that I bought the HF for one project. For a novice like I was, I will say the bit installation seemed a little tricky. You think its locked, but no SDS action, too slow. Pull it out of the hole, bits loose. Get it clicked in right and go to town.

It "only" saved about 4 hours, but that 4 hours with a regular hammer drill would have seemed like 20, with swearing and crying to boot. If I never use it again, it was worth it.