Thread: Scraping Projects

Just as well you've got a helper.

Hi Ray,
Way to pick something easy first up
You sure do need a bigger plate, its going to be a little crowded when you try to square it up.
I'll have to get started on my rotary table sometime.

Stuart

Originally Posted by Bryan

Just as well you've got a helper.

Hi Bryan, I wish.......
He's been complaining of a sore shoulder since the scraping class, and can't get him interested in anything that won't fit into the surface grinder.. Still he's got plenty of work in that department.

Originally Posted by Stuart

Way to pick something easy first up

Hi Stuart, The master plan (yes there is one?) is that when I get this angle plate flat and square, I'll use it to setup and grind the other smaller angle plates. So start with the biggest one first.

After lifting it on and off the surface plate a few times, it's getting lighter..

Regards
Ray

Originally Posted by Stustoys

I'll have to get started on my rotary table sometime.

Stuart

You've got me intrigued now, what are you planning to scrape on your rotary table?

Cheers, Ben.

Hi Ray,
Its always good to have a plan. How high does the head on your grinder go?

Hi Ben
I want to scrape the arrowed faces(and the one on the other side) square and parallel to each other and the base faces. Using stops I want to be able to stand the table up or lay it down without losing datum(within reason).

Stuart

stop complaining about scraping around the holes......they are a bonus...just imagine how heavy it would be if they wer'nt there

Glad its you and not me...certainly looks like you are going to be busy for a while

Hi Stuart,

I wasn't planning on taking pictures until I got a little closer, but since you asked..





Here's a problem area, there is a dent appearing that's running vertically through the middle.

I'm guessing it's the result of some long forgotten crash or maybe a dodgy setup, it's not all that deep, but it means scraping every thing down until I start to get bearing through the middle..

If it was easy, I guess it wouldn't be so much fun...

Regards
Ray

Hi Ray,
If you get bored you're welcome to put it on my shaper.(of course I dont really know that will make things better)
Thanks for the pictures

Stuart

That's pretty bloody good, Ray. Have you checked with feeler gauges HOW low the stripe in the middle is?

Joe

So Ray, what was your intention for this thread? The title sounds like a place for anyone to update their current scraping project. Which seems like a neat idea, like the 'show us your...' threads. But if you want to keep this for your angle plate or whatever, I'll start another one.

Originally Posted by Bryan

So Ray, what was your intention for this thread? The title sounds like a place for anyone to update their current scraping project. Which seems like a neat idea, like the 'show us your...' threads. But if you want to keep this for your angle plate or whatever, I'll start another one.

Hi Bryan,

Let's make it a place for "Show Us Your Latest Scraping Project" ... good idea.

Regards
Ray

Originally Posted by Bryan

So Ray, what was your intention for this thread? The title sounds like a place for anyone to update their current scraping project. Which seems like a neat idea, like the 'show us your...' threads.

Hi Bryan,
Thats what I thought as well, and it would be good to keep them all together instead of getting lost in the forum.

Dave

Well I didn't take any pictures (Boo Hiss!), but I had an experience worth relating. Decided to do my tailstock properly, or rather, less dodgily, and start at the bottom. The ways are hardened and I have no intention of messing with them. Wear appears negligible on the TS ways anyway. But I could easily rescrape the worn slides to the ways, using the ways as a template. (The moving bits are called the slides ok?)

Carefully filed the wear ridges off the slides, blued up the ways and into it. Started out banana shaped - high in the middle on all faces. After a few cycles, starting to see the blue spreading out nicely, except on the inner V face. Kept getting narrow lines of blue along the top and bottom of the face, as the blue got thinner. But the other two faces where still printing nicely. Kept cleaning everything and fussing over the amount of blue, but the pattern kept repeating. After a couple of hours of increasing frustration, the penny finally dropped. There were wear ridges on the ways! Too small to see, but just detectable with a fingernail.

The only thing for it was to relieve the edges of the sliding faces with a slight chamfer. Turns out a carbide scraper does a fair job of this, albeit with a little chatter. Problem solvered. I feel a right nong for taking so long to figure that out. But I guess I've never used machine members as templates before. And this problem is not in the books because when you really do it properly, you scrape the ways first and work up.

I think I'm preferring the Canode medium in this situation (smooth surfaces). It seems less smeary and more... spotty. Though My comparison was with bearing blue so maybe that's not a fair fight.

I will take a pic if I ever get it looking good enough.

Hi Bryan,
Arent they meant to be a little high in the middle?(most the the wear will happen at the ends and the last thing you want is for it to rock).

Stuart