Overhaul of a 9" SB model "A"

[ttrikalin]

Here's what it will look like....like it?

Like it very much!

I did my first scraping today
The book and DVD is not here yet -- will be sent on Thursday... but I decided to scrape flat a piece of mild steel... I think I did kind of OK, but I do not get such nice bearing as this...

I will start a new thread on my learning experiences for people to laugh -- but also for viewers to drop some hints along the way...

take care,
tom in MA

 

[steamer]

I look forward to it!

Dave

 

[Florian]

Love it!
And for your next one, can you make it look Swiss? You know, all of those tiny snowflakes.

Are you talking about such a pattern:? (Thats my work 8) )

The "Original Swiss Pattern" is made by using a pulling scraper and rotating the workpiece for 45° every pass.

The Scraper looks like the one on this picture and is being pulled. The Blade itself does not have any radius. The use of a pulling scraper results in very sharp edges on the small squares.

Cheers
Florian

 

[steamer]

Thanks Florian!

I'll see if I can experiment with that!

Dave

 

[Florian]

Oh and by the way: The pattern on my workpiece is acutally made with a "normal" scraper (not a pulling scraper)
If you look at it closer, then it will be different to the "original swiss pattern".

But from far.. it looks quite similar.

Dave: What strategy do you use when scraping?

I first roughly scrap over the surfaces without ever lifting the blade from the material.
I do this until i have some color-points all over the surface (only scattered).

Then i start with fine-scraping on one edge of the (mostly) rectangular surface.
I only "divide" all the points (except the very pale ones) into 2 or more points by scraping through the middle of them.
I always scrap in an thought "line" which is 45° to the long sides of the surface, which means i start on one side and scrap all the points in that "line" until i reach the other side.

That is how i get that pattern you can see on the picture above.

When fine scraping, i do put the blade on the surface just before the point and then scrap the point with 2 or 3 light and short strokes. (I found out that this is the way it works best for me...)

Cheers Florian
by the way: I actually make swiss pattern (can't be any different) as i live in switzerland ;D ;D

 

[steamer]

Then I'm glad we're all talking "Swiss" ;D

There is about 300000 ways to do anything isn't there?

I may stick with something that I can do with the tools I have....again I'll experiement

If you did yours without pull scraping, did you use a narrow,square ended blade?

Dave

 

[Florian]

Then I'm glad we're all talking "Swiss" ;D
There is about 300000 ways to do anything isn't there?

No further comment on this... ;D

No, I didn't use a small square blade.

As I said, if you look closer, you will see (actually you will not as the picture is to small) that the "squares" on my workpiece are not square and sharp-edged.

But from far it does look similar..

I did think about making a pulling scraper, and I think I will do so for the next pieces of work. Just to try it out.
Also its being told that with pulling scrapers you can reach a better surface quality which means less difference to the perfect planned surface as you do not "dig" in the durface like you do it with the "normal scrapter"...
As far as I know, pulling scrapers have been used to finish a surface and for fine scraping.

Florian

 

[steamer]

Thanks Florian!

I'll muddle around and see what I can do.

Dave

 

[ttrikalin]

Are you talking about such a pattern:? (Thats my work 8) )

[...]

Florian,
no image!

tom

 

[Groomengineering]

You're scraping looks great Dave!

I finished mine on a surface grinder. Probably not as accurate, but if I did it by hand I'd probably still be at it (10+ yrs later). oh:

Keep up the good work!

Cheers

Jeff

 

[Florian]

Hey Tom

Well, I can see it...
Can you see it now...?

Florian

 

[ttrikalin]

Florian, no I cannot. I see that the link is to an https in Dropbox -- perhaps for this reason? It may be unrelated...

take care,
tom

 

[steamer]

You're scraping looks great Dave!

I finished mine on a surface grinder. Probably not as accurate, but if I did it by hand I'd probably still be at it (10+ yrs later). oh:

Keep up the good work!

Cheers

Jeff

Jeff

If I had a surface grinder it would be done!
;D
Dave

 

[Florian]

I have changed it; it should now be possible to see the picture!

Cheers Florian

 

[ttrikalin]

I have changed it; it should now be possible to see the picture!

Ah, yes, beautiful pattern.
very neat!

take care,
tom

 

[steamer]

Got the top of the cross slide scraped parallel to the to the bottom of the ways to about .001" full length. I then took a near flat blade and cleaned up the top to good bearing and an attractive surface with a little decorative flaking with a fairly well curved blade and a series of draw strokes in "crosses". Even I can't screw this one up... :big:

Then I took the bottom to task AGAIN...and got the top parallel to the bottom to .0002" over full length...I'm at about the limit of my ability to measure with the equipment I have. I have a new to me Starrett tenths indicator that appears to work well, but will need a few bits of indicator stand furniture to mount up to my small Starrett #56 indicator stand. I should be able to have more confidence in the measurement by then.....I'm digging it anyway.

This will become a gauge for any saddle rework so it really needs to be good.

Dave

 

[steamer]

Quote from: Mosey on December 03, 2011, 08:48:31 PM
Love it!
And for your next one, can you make it look Swiss? You know, all of those tiny snowflakes.


Are you talking about such a pattern:? (Thats my work



Hey Florian , that looks great!

Dave

 

[ttrikalin]

me like!!! :bow: :bow:

this looks wonderful! you will have a lathe you will hate to use, man. talk about scratching this surface with chips...

take care,
tom in MA

 

[steamer]

I know the guy who did it and he'll give a deal to fix it... ;D

Dave

 

[arnoldb]

:bow: Great job Dave ! :bow:

Kind regards, Arnold