Q: how well and long do the bearings last ....I have some that last one cut ?

Mine are 1/2" shank. Not sure about your 1/4" bits but mine are still good as new.

Q: Can it cut aluminum

You can but the feed rate must be Very Slow. I prefer to use name brand router bits like Bosch, Amana or others.

Question 1

How critical is the rpm recommendations for router bits versus the routers rpm ratings?

Accepted Answer

It really depends on what material you'll be cutting, how you'll be cutting it, and whether you're using a router table or hand router.
There are TWO reasons for reducing blade speed: 1) to avoid burning the wood/blade and 2) to keep larger blades from spinning apart.  If you're using <=1" dia blades you can pretty much disregard the spinning apart bit.
I've been a professional woodworker for a dozen years and here's what I do: Check the manufacture's recommended blade speed, to get me in the ballpark.  Then start cutting at around that speed.  If the cut is rough, I'll increase the speed a bit.  If there's burning, I'll reduce the speed.  CRITICAL ISSUES will be when you change the wood feed rate (how fast you're plowing through the material), and when you change direction of cutting related to the grain (routing around rounded corners, changing routing angles).  If you're routing along the grain, there's minimal resistance on the blade, but as you go around corners or change angles you'll be going cross-grain which increases resistance.  Resistance=Heat.  Every cut is different.  Every wood is different.  Go slow and shallow, but NOT too slow, and always watch the cut so you can speed up or slow down as needed.  Also, for the advanced woodworker, there's the 'climb cut' (going backwards), which generally creates a whole lot less heat, but can be VERY dangerous.

Question 2

how well and long do the bearings last ....I have some that last one cut ?

Accepted Answer

Mine are 1/2" shank. Not sure about your 1/4" bits but mine are still good as new.

Question 3

Can it cut aluminum

Accepted Answer

You can but the feed rate must be Very Slow. I prefer to use name brand router bits like Bosch, Amana or others.

Question 4

Is the router poster sold separately?

Accepted Answer

No

ASIN	B08TZZR3Q7
Best Sellers Rank	#328,759 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #627 in Edge Treatment & Grooving Router Bits
Brand Name	KOWOOD
Customer Reviews	4.5 4.5 out of 5 stars (344)
Cut Type	Rabbeting Cut, Straight Cut
Cutting Diameter	1.27 Centimeters
Item Weight	5.64 Kilograms
Manufacturer	Kowood
Material Type	Carbide
Model	70-PCS
Number of Flutes	2
Part Number	70-PCS
Size Name	70PCS-1/2
UPC	770456327432
Unit Count	1 Count

KOWOOD Router Bits Set 1/2 Inch Shank 丨70 - Piece Set.

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