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-   -   Some scraping-videos (https://www.diybanter.com/metalworking/242229-some-scraping-videos.html)

Nick Mueller April 6th 08 10:32 AM
Some scraping-videos
 
Hi!

I made 3 hand scraping related videos:

Preparing the granite plate:
http://youtube.com/watch?v=8kWbIxB4z3s

Grinding the carbide plate:
http://youtube.com/watch?v=uIvxXMDeCIc

Scraping in a lathe's gap:
http://youtube.com/watch?v=uHF7TtHVSWE


Nick
--
The lowcost-DRO:
http://www.yadro.de

wstiefer April 6th 08 11:56 AM
Some scraping-videos
 


Nick Mueller wrote:
Hi!

I made 3 hand scraping related videos:

Preparing the granite plate:
http://youtube.com/watch?v=8kWbIxB4z3s

Grinding the carbide plate:
http://youtube.com/watch?v=uIvxXMDeCIc

Scraping in a lathe's gap:
http://youtube.com/watch?v=uHF7TtHVSWE


Nick

Thanks Nick,
Black Forest Elfin RULE!

Seriously, this is something I can use.

[email protected] April 6th 08 06:42 PM
Some scraping-videos
 
On Apr 6, 5:32*am, Nick Mueller wrote:
Hi!

I made 3 hand scraping related videos:

Preparing the granite plate:
http://youtube.com/watch?v=8kWbIxB4z3s

Grinding the carbide plate:
http://youtube.com/watch?v=uIvxXMDeCIc

Scraping in a lathe's gap:
http://youtube.com/watch?v=uHF7TtHVSWE

Nick
--
The lowcost-DRO:
http://www.yadro.de

Nick,

Excellent resources you've posted.

I've done this work extensively with a die grinder to flatten the
bottom of large inserted die blocks. It's neat to see the finer work
accomplished with a scraping blade.

I guess it should be noted that those without access to a surface
grinder to can use a die grinder (or even a disc grinder) for heavy
material removal before they switch to a scraping blade, if the
surface is severely warped.

There's a certain amount of technique required to get solid results
while doing this type of work. I found the biggest issue is to make
sure that the middle of the block is not "higher" than the outer
edges. This will cause the block to rock when rubbing on the surface
plate, resulting in a false reading with the blue (the whole surface
will look good with the blue, but it's actually a convex dish shape).

I tend to clear the middle of the block pretty much completely when
starting out to make absolutely certain this false reading doesn't
happen. Once the outer perimeter comes in flat, I bring it down
uniformly, making sure to remove any readings in the middle section.
Eventually, the whole middle comes in and you're there.

Regards,

Robin

Nick Mueller April 6th 08 07:08 PM
Some scraping-videos
 
wrote:

There's a certain amount of technique required to get solid results
while doing this type of work. I found the biggest issue is to make
sure that the middle of the block is not "higher" than the outer
edges.

Not *that* difficult. Put work on the plate, try to rock it. If you *hear*
that it rocks, you know you're off a lot. If you don't hear it rock, put a
dial indicator onto two corners and try to rock it. If the dial moves, you
know that you have to pay attention. That is done by rough scraping in the
middle and observing the pattern you get when touching.

Its always important to observe how the high spots move. If they move or pop
up here and there, there's something wrong.

BTW:
The bed insert had to be redone, because the mating surface in the gap was
all except flat. I scraped the bed's gap flat (had to scrape a surface
plate for that), but then the insert was too low (I knew that before).
Measured what extra material I needed (0.1mm) milled pockets into the
bridge, filled them with multimetall and put it onto the granite plate with
0.1mm shims. So I didn't have to scrap that much. Multimetall is easy to
scrape.

Also did all the guides in Moglice. *GREAT* material!
I'm not completely through with the lathe, because I'm in the middle of
redoing the seats for the spindle bearings. They are non-axial. All on a
brandnew lathe. Chinese crap! My last tool I have bought from those liars
and idiots! http://www.yangzhoumachine.com


Nick
--
The lowcost-DRO:
http://www.yadro.de

Gunner Asch[_4_] April 6th 08 07:13 PM
Some scraping-videos
 
On Sun, 06 Apr 2008 11:32:42 +0200, Nick Mueller
wrote:

Hi!

I made 3 hand scraping related videos:

Preparing the granite plate:
http://youtube.com/watch?v=8kWbIxB4z3s

Grinding the carbide plate:
http://youtube.com/watch?v=uIvxXMDeCIc

Scraping in a lathe's gap:
http://youtube.com/watch?v=uHF7TtHVSWE


Nick

Damn, that was nice of you to do.

Gunner



"Pax Americana is a philosophy. Hardly an empire.
Making sure other people play nice and dont kill each other (and us)
off in job lots is hardly empire building, particularly when you give
them self determination under "play nice" rules.

Think of it as having your older brother knock the **** out of you
for torturing the cat." Gunner

Wes[_2_] April 6th 08 09:18 PM
Some scraping-videos
 
Nick Mueller wrote:

Hi!

I made 3 hand scraping related videos:

Preparing the granite plate:
http://youtube.com/watch?v=8kWbIxB4z3s

Grinding the carbide plate:
http://youtube.com/watch?v=uIvxXMDeCIc

Scraping in a lathe's gap:
http://youtube.com/watch?v=uHF7TtHVSWE


Danka schein Herr Mueller.

Nick Mueller April 6th 08 09:40 PM
Some scraping-videos
 
Wes wrote:

Danka schein Herr Mueller.

Yar wullcomer, Mr Wes. ;-))


Nick
--
The lowcost-DRO:
http://www.yadro.de


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