End play problem with Rotary Hammer Drill when using a long 450mm drill bit

[benawhile]

Hello

I purchased a Wickes Rotary Hammer drill this week
Model PDH26DS1.1
I had also purchased a drill bit 16mm x 450mm

The hole I need to drill is 16mm x 350mm through external brickwork

I have not used a SDS set up before.

There is some backward and forward movement of the drill bit sliding in the chuck, which is intentional due to the design, but I notice there is also slight lateral play where the drill shaft is held in the chuck.

I have to use a long drill bit, 450mm, and so this play translates to over 10mm at the far end of the bit and is very noticeable when the drill is in operation before the bit is applied to the work, such as to make it not possible to start with a clean hole.

My query is, is this normal? I found drilling a smaller pilot hole made it possible to stabilise the far end of the 16mm bit when drilling the final hole but I was still concerned at the amount the drill bit was wobbling.

[etaf]

is the drill bit an SDS Bit
see sds shank here
https://en.wikipedia.org/wiki/Drill_bit_shank

[benawhile]

Definitely, SDS plus shank
Thank you, I should have stated that

[etaf]

10mm is a lot of runout

is that the only sds bit you have
if you roll the bit on a flat surface - kitchen worktop ,does it roll flat

[benawhile]

Wow! Good call, there is a slight but distinct run out. I wasn't expecting that. I will return it. Many thanks.

[etaf]

you are welcome, glad its sorted

[benawhile]

Update
Wickes agreed to exchange or refund the bent drill bit if I could find a straight one in the store. 4 on the shelf, only 1 was straight. But there still seems to be excessive end play. In the mean time Wickes Customer Service Technical have advised that the end play I describe is excessive and offered to refund the drill. I have had diverse opinions on what amount of play is acceptable. Some say it is unavoidable, others say there should be none, so I might shop around.

[Rorschach]

A bend is not uncommon in SDS bits unfortunately, I have had bent bits from Bosch who you would think would have good QC. A little bit is usually ok as it's not like they are used for precision work but on longer bits it really be a problem and dangerous.

[dewaltdisney]

I have had Titan SDS from Screwfix over the years and I am on my second after sterling service from the original. Heavy drilling and chiseling is a breeze, have a look at https://www.screwfix.com/c/tools/sds-dr ... sdrill#_=p if you get a refund

DWD