Acceptable run-out for BHC drill chuck

[Slartibartfass]

[member=47173]Brent Shively[/member]  I know the BHC is not a precision boring tool and run out can be caused by a multitude of things including the drill bit itself but there is a noticeable wobble of the SDS chuck. I figure that this could cause the final hole to be a size bigger than the drill size. Is this within the spec?

Took a short video that I would be happy to share if I could post it or I can email....

Here is a dropbox link to the videos:

https://www.dropbox.com/s/v8m6kbsc8mntvwi/File%20Jun%2005%2C%207%2057%2004%20Pm.m4v?dl=0

https://www.dropbox.com/s/bq4zgx4dpyhwrt4/File%20Jun%2005%2C%208%2001%2031%20Pm.m4v?dl=0

 

[TelcoRandy]

Can you take a video of the end of the bit while it's spinning? You can't really judge runout by looking at the rubber bumper at the end of the chuck.

 

[tjbnwi]

I did not notice any run to using my BHC today. I used the Festool 5, 8 and 10 mm bits that came in the set Festool offers.

I do like that the set nests into the Sys. Now we need an imperial set.

Tom

 

[AlexThePalex]

SDS bits are meant to move inside the chuck, a bit of play is unavoidable.

 

[aas]

I can clearly see the wobble in the videos, it's not acceptable, get it back to Festool.

I had the same problem with my Makita DHR243, the removable SDS chuck wobbled, it made holes larger than they should be. Great service by Makita, they sent me a new one no questions, they simply asked I send the old one back so they could check it, and they confirmed it was a manufacturing fault.

 

[jonny round boy]

I can clearly see the wobble in the videos, it's not acceptable, get it back to Festool.

I had the same problem with my Makita DHR243, the removable SDS chuck wobbled, it made holes larger than they should be. Great service by Makita, they sent me a new one no questions, they simply asked I send the old one back so they could check it, and they confirmed it was a manufacturing fault.

I disagree. The wobble that can be seen in the videos is in the collar that's used to release the bit. That is not connected to the shaft, it's essentially floating, held only by a spring. The fact that there's wobble there is unavoidable, but it bears no relevance to the drill shaft.

There's no wobble or eccentricity visible in the bit itself where it comes out of the chuck; as others have said it would help to see the working end of the bit.

 

[aas]

I can clearly see the wobble in the videos, it's not acceptable, get it back to Festool.

I had the same problem with my Makita DHR243, the removable SDS chuck wobbled, it made holes larger than they should be. Great service by Makita, they sent me a new one no questions, they simply asked I send the old one back so they could check it, and they confirmed it was a manufacturing fault.

I disagree. The wobble that can be seen in the videos is in the collar that's used to release the bit. That is not connected to the shaft, it's essentially floating, held only by a spring. The fact that there's wobble there is unavoidable, but it bears no relevance to the drill shaft.

There's no wobble or eccentricity visible in the bit itself where it comes out of the chuck; as others have said it would help to see the working end of the bit.

I downloaded the video and watched fullscreen - I can see a wobble on the shank of the drill, about 3/4 of the way up the visible section (so not where the fluting starts)!.. I didn't even look at the collar, as having been an SDS user for decades, I know full well that the collar can wobble and it is irrelevant.

Of course it would be more apparent if the video showed the tip of the drill, but then I'm sure people would claim the drill bit is bent! 

 

[Brice Burrell]

I've got a crazy idea here, try using the drill and see how it works.

 

[charley1968]

+ 2, Brice

 

[Dangermouse]

That looks fine to me, the shrouds on all sds drills wobble, as said it serves no structural purpose, at the end of the day it's a drill that's designed to drill holes in concrete,