The Rodding Roundtable

Motorhead Message Central => Rodder's Roundtable => Topic started by: Crosley.In.AZ on April 25, 2010, 02:56:48 PM

Title: Question on machinist term
Post by: Crosley.In.AZ on April 25, 2010, 02:56:48 PM
Looking in Enco  catalog...  

Horizontal - Vertical Rotary table.

One spec listed is gear ratio 90:1 ...  accuracy within 40 seconds

40 seconds of what?  is my question

:?
Title: Re: Question on machinist term
Post by: tomslik on April 25, 2010, 03:03:00 PM
Quote from: "Crosley"Looking in Enco  catalog...  

Horizontal - Vertical Rotary table.

One spec listed is gear ratio 90:1 ...  accuracy within 40 seconds

40 seconds of what?  is my question

:?

my guess is that it's less that 1 degree,less that 1 minute kinda thing.
as in really accurate BUT i have no idea what "really" accurate means as it's knida relative...
Title: Question on machinist term
Post by: 2rods on April 25, 2010, 03:17:03 PM
40 seconds of a degree
Title: Question on machinist term
Post by: tomslik on April 25, 2010, 05:20:55 PM
Quote from: "2rods"40 seconds of a degree

where do minutes come in?
Title: Question on machinist term
Post by: PeterR on April 25, 2010, 05:51:26 PM
Quote from: "tomslik"
Quote from: "2rods"40 seconds of a degree

where do minutes come in?

360 Degrees to a full circle
60 minutes to one degree
60 seconds to one minute

40 seconds = (40/60)minutes =(40/60)x(1/60)degree = 0.01degree
Title: Question on machinist term
Post by: chimp koose on April 25, 2010, 08:06:45 PM
By the way a minute of TIME in the last machine shop I worked at would cost you $2.
Title: Question on machinist term
Post by: unklian on April 25, 2010, 10:08:43 PM
Quote from: "PeterR"
360 Degrees to a full circle
60 minutes to one degree
60 seconds to one minute



Yes, that is correct.
Title: Question on machinist term
Post by: Glen on April 26, 2010, 12:20:18 AM
Tony, I have a very nice rotary table if you need to use it.  It is already mounted to the Mill, I was using it today for these blocks.