Dado speed

wa2crk · Post by **wa2crk** » Thu Mar 29, 2012 8:48 am

Hi All
I was making a drawer box the other day and had to cut some 1/4 by 1/4 dados and decided to see what the Power Pro headstock said about dado speed. I was a bit surprised to find that the recomendation was 3600 RPM.
The standard headstocks have the dado speed set below sawing speed. Just curious as to the reason for the increased speed. Could be that because the PP motor has constant torque over the entire speed range that the speed was raised? Wonder what the rest of us think.
The sawing speed on the PP is pregrogrammed at 3450 RPM
Bill V

dusty · Post by **dusty** » Thu Mar 29, 2012 9:05 am

wa2crk wrote:Hi All
I was making a drawer box the other day and had to cut some 1/4 by 1/4 dados and decided to see what the Power Pro headstock said about dado speed. I was a bit surprised to find that the recomendation was 3600 RPM.
The standard headstocks have the dado speed set below sawing speed. Just curious as to the reason for the increased speed. Could be that because the PP motor has constant torque over the entire speed range that the speed was raised? Wonder what the rest of us think.
The sawing speed on the PP is pregrogrammed at 3450 RPM
Bill V

Router speeds are typically higher than the designated range for routing using the Mark V. Therefore, this seems consistent. We know that the Mark V is not the best tool to use for heavy routing.

JPG · Post by **JPG** » Thu Mar 29, 2012 1:56 pm

dusty wrote:Router speeds are typically higher than the designated range for routing using the Mark V. Therefore, this seems consistent. We know that the Mark V is not the best tool to use for heavy routing.

Who said anything about 'routing' dados?;)

P.S. Speed charts for 6" dado blade are 3600!

beeg · Post by **beeg** » Thu Mar 29, 2012 2:00 pm

[quote="JPG40504"]Who said anything about 'routing' dados?]

That's known as a "jpgism":D

paulmcohen · Post by **paulmcohen** » Thu Mar 29, 2012 4:23 pm

[quote="JPG40504"]Who said anything about 'routing' dados?]

The PowerPro does not have a setting for 8" Dado blades, what does the chart say? If it says nothing, what do people think the speed should be?

dusty · Post by **dusty** » Thu Mar 29, 2012 4:33 pm

paulmcohen wrote:The PowerPro does not have a setting for 8" Dado blades, what does the chart say? If it says nothing, what do people think the speed should be?

I wonder if there might be a reason for that. Maybe this deserves a call to Customer Service.

JPG · Post by **JPG** » Thu Mar 29, 2012 5:45 pm

paulmcohen wrote:The PowerPro does not have a setting for 8" Dado blades, what does the chart say? If it says nothing, what do people think the speed should be?

2400(L/M) on my chart!

So am I to assume the PP does not ask for the size?

What chart are you looking at that says 'nothing'? My 510 manual does not even mention dado sawing.

JPG · Post by **JPG** » Thu Mar 29, 2012 5:48 pm

dusty wrote:I wonder if there might be a reason for that. Maybe this deserves a call to Customer Service.

Are they currently selling an 8" dado set?

Dave will tell you it has been there since the Mark 5 was invented!;)(sometime in the 50's):rolleyes:

paulmcohen · Post by **paulmcohen** » Thu Mar 29, 2012 7:07 pm

JPG40504 wrote:2400(L/M) on my chart!

So am I to assume the PP does not ask for the size?

What chart are you looking at that says 'nothing'? My 510 manual does not even mention dado sawing.

The math says 2700 RPM would give you the same linear speed for an 8" blade as 3600 RPM gives you with a 6" blade. The PowerPro lists only a 6" dado blade in its built in Chart.

Given that most table saws have a fixed speed of 3450 RPM, I assume the blade can operate safely at that speed but I have emailed Infinity to ask if they have a recommended speed.

The "Chart" I was asking about is the new chart that Shopsmith is giving away free with $75 purchase.

dusty · Post by **dusty** » Thu Mar 29, 2012 7:32 pm

paulmcohen wrote:The math says 2700 RPM would give you the same linear speed for an 8" blade as 3600 RPM gives you with a 6" blade. The PowerPro lists only a 6" dado blade in its built in Chart.

Given that most table saws have a fixed speed of 3450 RPM, I assume the blade can operate safely at that speed but I have emailed Infinity to ask if they have a recommended speed.

The "Chart" I was asking about is the new chart that Shopsmith is giving away free with $75 purchase.

How can you expect "the chart" to tell you what RPM to operate at. The author of that chart (or any other chart for that matter) has absolutely no knowledge of the performance characteristics of something that you are going to mount on that arbor.

The most the chart can do, without calling out specific hardware, is provide the user with a "guide" to approximate operating speeds.