Countersink Review

[9fingers]

I ordered these from Banggood using the link Dave L provided.

http://www.banggood.com/4pcs-Countersin ... 29096.html

They took about a week to arrive. 1st impression was that they could have been better packed as all 4 were in a bag together with no protection to stop them knocking into each other. The cutting edges were a little rough as the holes forming them were roughly formed leading to a mildly serrated catting edge. These could be easily dressed with a diamond file but I have tested these as delivered.

I don't have much soft pine around in the workshop but found a bit of 2x1 PAR lurking in the garage with pretty wide spaced growth rings.

I drilled holes to match the shank sizes of 12, 10, 8 and 6mm



and then cut a full depth countersink with each bit at 250 rpm. I always believe in slow countersinking to minimise chatter although this design of cutter is highly unlikely to chatter anyway. This is achieved by most of the cutter body rubbing on the wood so slow speed will avoid burning. So medium pressure only to keep the heat down.

The smallest cutter did pull off centre a bit



the others were much better at centring








These photos were taken with no cleaning up at all and the lack of tear out at maximum diameter ie the part that will be seen is very respectable indeed.
The surface inside the countersink where the bit was cutting across the fibres could have been better but I put this down to not being perfectly sharp but bear in mind this will not be seen.
All in all pretty useful items to have in the workshop and good value for money. Score 9/10

Here they are again in their newly made stand.



Bob

 

[Stargazer]

Thanks for the update and review Bob. I will be looking to get some as my only countersink bits are two very worn/wrecked star type that make such a mess of the wood that I usually end up resorting to a 13mm drill to effectively counterbore the hole so the screw head is below the surface.

 

[Woodster]

I've got a couple of these, a 10mm and 25mm and they both work well.

 

[Commander]

Excellent! Thanks for the feedback Bob!

 

[Phil]

Thanks for the update and review Bob.

:text-+1: :text-goodpost:

 

[MikeJhn]

I bought a set about eighteen months ago off e-bay and they are still as good as new, even though I have used them on mild steel as well as Oak, certainly better accuracy and finish than the traditional multi tooth type.

Mike

 

[justaskin]

Good write up Bob.
Personally I had more luck with the countersink version with the pilot drill, especially when putting down decking with out splitting it and wandering.

Richard