Accuracy of using visual

[T Bredehoft]

light between the part and square will actual turn a blue when within tenths.

Yeah, that's what I was taught, used it numerous times. You're then measuring the wavelength of the light. or some such.

 

[Cadillac]

Can you direct me to which episode on YouTube he mentions this? I didn't see one that mentioned this directly.

Sure the name of the video is how to square a part within .0001 on a SG. He shows all the ways to check about 3mins into the video.

 

[stuarth44]

Also how much does a file remove on average for fine file and bastard cut file.

depends on how much weight you apply, use kero or wd40 on soft metals, but you,ve only got to see how many shavings come off when ,say, filing an axe to see how much, btw never file both ways pressure on the away stroke, files are not cheap, as with a hacksaw just pressure on way, lift the tool slightly on back stroke, trade schools are no more here, probs they did not teach these things, but they did 56 years back)

 

[Mini Cooper S]

use kero or wd40 on soft metals, )

He means soft metals like aluminum, be careful with oil on steel. Some steels (I.E. 4140 and tool steels) can glaze over with oils, even oil from rubbing your fingers over the work, and your file will just slide over the surface. Not good for the life of the teeth on the file.

 

[Koi]

Is there any numbers as a reference

 

[darkzero]

Also how much does a file remove on average for fine file and bastard cut file.

That's hard to say. As someone mentioned it depends on how many pounds the gorilla weighs who is doing the filing. Also depends on the quality of the file & the brand. Like one brand's fine file may not have the same pitch of teeth as another brand. It also depends on the file size. You can get a 6" & a 12" file, both in bastard cut or whatever, same brand, & the pitch of the teeth won't be exactly the same.

 

[Cadillac]

Is there any numbers as a reference

Count your strokes be aware of your technique and take measurements. Like said above their are way to many variables. If you wanna get anal weigh the filings after so many strokes.

 

[Koi]

He means soft metals like aluminum, be careful with oil on steel. Some steels (I.E. 4140 and tool steels) can glaze over with oils, even oil from rubbing your fingers over the work, and your file will just slide over the surface. Not good for the life of the teeth on the file.

I remember looking at others forun stating oil will only cause file to glide and use chalk instead.

 

[Koi]

t

here are ways n ways of filing, draw file in the start and yes you can file true, dead true, needs practice, n thas all I have to say 'bout that)

i do it by bringing the surface quite flat with conventional technique by holding my file close to my torso and move my body instead and when im nearly flat i and square i will use the curved part of a needle file to file down the hump and its a bit of guess work and leaves frustrated me every time when i dealt with a problem and another shows up.

 

[Koi]

Does accidentally tapping an engineer square affect its squareness like a small sharp tap on another piece of metal tube by accident.