The new scraping thread

[Jekyll and Hyde]

Who is busy this saturday?

ALPA Clearing Sales - Rural Property, Sales Calendar, Clearing Sales, Livestock, Australian Rural Property, Australian Livestock, Australian Property, Rural Realestate

Oh, fer cryin' out loud, always interstate!

It's probably a good thing I can't justify getting up at 2 or 3 in the morning to go for a little drive, because I might not have any money left for petrol to get back....

[RayG]

Found this in Melbourne

http://www.toolingonline.com.au/home...category_id=63

Hi .RC, Thanks for posting that, I'll be down that way tomorrow, I might pick one up. if I can save the freight cost, 400x400 is a useful size for what I need.

Regards
Ray

[Bryan]

What is a "Smooth 'Ball bearing' surface"?

Bryan,
Did you get in before their price rise?

Stuart

Nah, I paid about 500 delivered for a 400 x 600. You'd think you'd get some documentation for that price but you'd be wrong.

[Stustoys]

Bryan,
As I've said elsewhere, I wasn't very impressed after waiting 8 months for them to get them back in stock to find the price had gone up 40% even with what the $AU had done. Still, its their job to set their prices and my job to decide if I will pay it or not.

Does it say where it was made?
Stuart

[Greg Q]

Thanks for the link RC. I sent a message regarding larger sizes (I imagine I'm not Robinson Crusoe there?)

Greg

I got a reply from Ariel at online tooling-they are looking into the larger sizes. I linked this thread inviting them to post on it directly.

Greg

[Anorak Bob]

I don't know...a lot of what was done decades ago was based on a less than perfect understanding of the physical world at the microscopic scale. I think two scraped surfaces have plenty of scope for oil retention, but the flaking may aid in distribution. You know how one way will have a little furrow in it for to allow oil to wick from the oiler across a larger area? I reckon the flaking is supposed to pick up oil from that and spread it laterally across the way.

I'll have to draw it out later.

I don't think that I have ever seen flaking on a Deckel mill. I'd be interested to know what's under Bob's Schaublin ways. The Perrin has no evidence of flaking either.

Apart from that there is the other area that Bob asked about: the decorative effects. That's an area that interests me very much, but there's not much info on it. My early attempts at that have been crude but not disheartening.

GQ, I have not removed the horizontal headstock so I can't comment on the extent of scraping on the body ways. Here is the visible scraping.

BT

[Pete F]

Bob are all those pictures of scraped surfaces? The first couple look more like grinding with frosting/flaking added. It may just be how it looks in the photos.

Pete

[Bryan]

Does it say where it was made?
Stuart

Made in China on the box. Now there's a surprise.

[Anorak Bob]

Bob are all those pictures of scraped surfaces? The first couple look more like grinding with frosting/flaking added. It may just be how it looks in the photos.

Pete

Just shows how much I know about frosting / scraping Pete, F A . I'm here to learn.

I found a couple of photos of another 13 with the horizontal headstock removed. Whilst not really clear you can see scraping on the ways of the main casting. Keeping these photos company is one of an FP-1 showing frosting on it's vertical ways which suggests that both the Swiss and their neigbours partook in self abuse.

[Pete F]

With your standards of workmanship I can imagine you getting in to scraping in a big way Bob. The last photo shows some nicely scraped slides.

[Byc]

Yes Love the wood and well done

[Anorak Bob]

The 13 would benefit from some correctly applied scraping. Wear is apparent in the X and Y axes. The machine is 49 years old. It's not bad but there is a discernable tightness towards the limit of travel in those directions. I would want to be proficient in the art before I tackled the task. I will watch keenly as this tutorial progresses.

BT

[Stustoys]

Made in China on the box. Now there's a surprise.

Not as surprising as finding out the little one I bought is Taiwanese. lol

Stuart

[RayG]

Found this in Melbourne

http://www.toolingonline.com.au/home...category_id=63

Hi .RC,

Thanks again for finding that, I bought one on line from the website and picked it up this afternoon, the guy has a pretty good range of stuff, but since he is really only setup only for on-line sales, you have to ring to arrange a pickup time. But seeing it weighs 55 kg, pick-up is a good option if you live in Melbourne. I imagine freight would be expensive.

Nice guy, very helpful.

Here is the surface plate, comes with a calibration sheet and looks ok, although I don't profess to know what constitutes a good surface plate. 400x400x100 for $250 seems like a good deal to me.



Now I can start properly checking those squares and angle plates.

Regards
Ray

[mic-d]

I went looking for some links I found when I was beginning scraping. Here is one of the fellows at Kitamura with the heavy duty pelvic thrust method

[ame="http://www.youtube.com/watch?v=PQEUScJvRNU&feature=related"]YouTube - ‪Kitamura Hand Scraping of a Vertical Machining Center‬‏[/ame]

This is more like a standard method, except I think you need to be more constant once you've settled on the direction you are scraping this iteration.

[ame="http://www.youtube.com/watch?v=uHF7TtHVSWE"]YouTube - ‪scraping in a lathe's bed // Bettbrücke einschaben‬‏[/ame]

From good old Wiki, what a finely scraped surface looks like.


This scraping summary pdf may also be of use.


A couple of my scraped planes:
BILD0058.jpg Attachment 172035

Also for anyone interested in one way of sharpening the TC scraper insert, there is an explanation of how I do it at the bottom of this link. Note I only use the 3000grit diamond powder now and it still gives a fine mirror finish to the TC.