Burr File

[sshire]

Sitting by the fire reading Connelly (which Richie dropped off from his Brown truck this morning)



It seems that one must have a burr file or all is lost.
I've think I've figured out that it's a dull file or a new file dulled on a bench stone.
1. Is that correct?
2. Define dull. How do I know I've made it dull enough?
3. Are there any better alternatives?

[crueby]

And what does he say to use it for?

[Dave Otto]

That is a great book; everyone should have a copy. Do you have your sights set on something to scrape?

Dave

[zeeprogrammer]

Burr file? Crap. Off to google again. Yet another thing I've never heard of. 

[b.lindsey]

Is it as simple as a file used just to remove burrs? Nope apparently not ...this post from practical machinist may help with its use and manufacture. I learned something too!  Your look mighty comfy there Stan with your feet up and the fire going

Bill

[sshire]

The scraping raises burrs and must be deburred before the next iteration of applying the hispot blue and scraping.
Connelly then devotes nearly a page to burr formation.
Stoning to remove the burrs will "produce noticeable scratches in the work surface. On softer metals...the stone will soon be loaded"
"A well-worn burr file...will neither scratch nor clog"

[sshire]

Dave
I've gotten pretty consumed with metrology and my main interest in scraping will be to flatten and square the precision square that I'm making (Lautard, vol 2) and angle plates for use on the surface plate.
Along with the Shipton and Simpson build, I've been making a squareness comparator and cylinder square which started life as a wrist pin.
My machinery dealer has just gotten a Starrett Pink surface plate (12x18) which was certified 2 months ago. I'm thinking about it.

[b.lindsey]

12 x 18" and pink...that would be a sweet addition Stan!!

Bill

[sshire]

The coffee and a dozen donuts always seems to help the price. He has a few dozen beautiful surface plates but they're all 3 feet and larger and about a foot thick.

[Dave Otto]

Dave
I've gotten pretty consumed with metrology and my main interest in scraping will be to flatten and square the precision square that I'm making (Lautard, vol 2) and angle plates for use on the surface plate.
Along with the Shipton and Simpson build, I've been making a squareness comparator and cylinder square which started life as a wrist pin.
My machinery dealer has just gotten a Starrett Pink surface plate (12x18) which was certified 2 months ago. I'm thinking about it.

Won't be pink for long, it will be pink with a nice blue tint.
Go for it Stan, it is something that I have wanted to try for a long time but have never had the time to persue.

Dave

[sshire]

Dave
That's because you have that "work" thing going on.

[sshire]

I needed another acquired skill since I seem to have the whole screwdriver thing sorted out.

[90LX_Notch]

Stan if you are that serious you should look into taking Richard King's scraping class.  It is something that I would love to do but it just never works out.

-Bob

[10KPete]

The scraping raises burrs and must be deburred before the next iteration of applying the hispot blue and scraping.
Connelly then devotes nearly a page to burr formation.
Stoning to remove the burrs will "produce noticeable scratches in the work surface. On softer metals...the stone will soon be loaded"
"A well-worn burr file...will neither scratch nor clog"

I'm not going to argue the point, especially considering the source. I use a stone, a fine carborundum, and have not experienced a scratching problem. Now, I'm not making a mirror but the surface is pretty shiny. The scratches I get are from my less than professional scraping.!!

Pete

[sshire]

Pete
I've been watching some videos of guys with 20-30 years experience scraping. They all use mineral spirits and stone the burrs.
Connelly may be rolling over in his grave (assuming he's dead) but I'm going with my fine Norton stones.

Bob
I have no idea how serious I am about this. I'm not going to rebuild a machine and for damn sure not touching my Bridgeport.
Really just curious at this point. We'll see how it goes. You do know that the classes are about $800.