Thread: 12" level - choices

Originally Posted by Oldneweng

Didn't use trig myself, left it to the computer. I checked it using CAD and came up with 1.75mm to 2 decimal places accuracy.

Dean

SINE .1 X 1000......=1.745328366

There is an android app called RealCalc. Really handy as it is a full scientific calculator and is free.

Ew

Originally Posted by Stustoys

trig and I have never been friends. I worked out the circumference of a 2m circle and went from there.
Got the same answer though :P

Stuart

It is one of the things I have hardly used and so have forgotten the details. I could look it up but it took longer for the program to load than for me to get the answer once it was loaded. Circumference of a circle will get an answer close to right! You just have to remember that you are taking the measurement along a circular path instead of a straight line.

A mate working with very accurate GPS equipment on a Challenger with long (1200mm) ripper for a vineyard on this occasion, asked the surveyer who was setting out the property, why there was a 400mm difference between the surveyors figures and the ones from the GPS system for property length. GPS works on surface distance, surveys work on straight lines, thru the earth. 400mm would be about right he said.

Dean

Originally Posted by Oldneweng

You just have to remember that you are taking the measurement along a circular path instead of a straight line.

Damn I missed that one.
Lucky I'm not a navigator.

Stuart

Originally Posted by Ueee

SINE .1 X 1000......=1.745328366

There is an android app called RealCalc. Really handy as it is a full scientific calculator and is free.

Ew

SINE .1 X 1000 ........ =1.74532836589830883577820272085

The circumference of 0.1 deg of the circle is 1.7453292519943295769236907684886mm.

See what I mean.

There is a Windows App called ..................

Dean

Originally Posted by Stustoys

Damn I missed that one.
Lucky I'm not a navigator.

Stuart

A navigator is supposed to take the circular path, outside science fiction that is!

Dean

For lathe levelling, I found this to be very sensitive. Yet will not drive you crazy. 0.1mm/m per division is more sensitive than what I can adjust with the levelling screws that come with the Hercus 260 between stand and lathe bed.

https://www.woodworkforums.com/f65/to...ml#post1614859

To align, I simply put the level onto the cross slide. No need for a 12" level. 6" is really all you need.

To give you an idea how sensitive 0.1mm/m is when doing lathe alignment: I put the level onto the cross slide of my Hercus 260, then drive the saddle as far to the right as it goes. Now I push the tailstock with a force of about 10kg away from me, to twist the bed. The bubble in the 0.1mm/m level moves by full 5 divisions. And that is with the lathe firmly bolted down onto the heavy steel stand. That is how rigid a 160kg 10" lathe is.

Chris

Well dont i feel silly. I used cad as well but it was about 3am so things were a bit blurry when i posted later on.
I think it was 0.02 degrees for a 0.02x1000mm triangle and i lost a decimal point in my sleep (dont you hate that)


Still a great tool and you should all buy one
That eBay seller has great service too.

Originally Posted by Ueee

SINE .1 X 1000......=1.745328366

There is an android app called RealCalc. Really handy as it is a full scientific calculator and is free.

Ew

Got it too. Use it all the time.

Originally Posted by Machtool

Some one check my trig, but I make out a change of 0.1 degree over a meter to be about 1.75mm

G.Q has a 15 inch Starrett 199 for sale. Its what the Americans call a master precision level. It $350 bucks though.
https://www.woodworkforums.com/f223/s...-level-175635/

Pictures and an R.C review are here:
https://www.woodworkforums.com/f223/s...el-box-174671/

Regards Phil.

Dam! I just bought one of these

Igaging Angle Cube Digital Angle Protractor Gauge | eBay

for general setting of rough angles and now I was thinking I can use it to level my lathe too!

Simon

So we're agreed the digital thing is for putting up shelves?

Originally Posted by Bryan

So we're agreed the digital thing is for putting up shelves?

WOW! You can get it to put shelves up? I should have bought two!

Originally Posted by cba_melbourne

For lathe levelling, I found this to be very sensitive. Yet will not drive you crazy. 0.1mm/m per division is more sensitive than what I can adjust with the levelling screws that come with the Hercus 260 between stand and lathe bed.

https://www.woodworkforums.com/f65/to...ml#post1614859

To align, I simply put the level onto the cross slide. No need for a 12" level. 6" is really all you need.

To give you an idea how sensitive 0.1mm/m is when doing lathe alignment: I put the level onto the cross slide of my Hercus 260, then drive the saddle as far to the right as it goes. Now I push the tailstock with a force of about 10kg away from me, to twist the bed. The bubble in the 0.1mm/m level moves by full 5 divisions. And that is with the lathe firmly bolted down onto the heavy steel stand. That is how rigid a 160kg 10" lathe is.

Chris

OK Thanks. I was asking because my large Hendey lathe is resting on a concrete floor, that I know slopes towards a corner of the shed . I roughly checked the hendey last night with a builders level across the V ways at each end of the bed .. it seems to be sitting level . The lathe
base is oriented across the slope of the floor - diagonally . I WAS worried
about the Hendey bed becoming twisted permanently