Scraping in a lathe's top slide (with tapered gib)

[firstatworst]

As technical as this process is, it would make it easier if you would talk about the steps.Cant figure out why you never say a word.

[turbotona25]

Great vid man but I have a question I would like to rescrap in the top of my Bridgeport table is that possible? What would I use as a gauge?

[MuellerNick]

@turbotona25

That would be a pain! Normally, thats a job for a shaper/planer or a surface grinder.

But if you are a masochist:

a) a surface plate a bit bigger than the table

or b) a camel back as long as the table plus a surface plate as wide as the table

[stillbashingmetal]

Great to watch and see how a pro does this. How much metal(mm/thous) are you scraping off?

[MuellerNick]

@stillbashingmetal

It depends. :-)

The bigger the area to scrape, the bigger the pain. In this case, there wasn't a lot to take off. A few 1/100 mm maybe. But even 1 mm and more is doable. It just takes longer and you have to rough cut. The trick is to decide when to stop roughing. I'ts a common error to stop that too early.

[FueShuN]

i dont know wut any of these vids are about, but they all pretty much rule and i watch them all the time. theyr futuristic and i pretend ur buildin spaceships lol

[billgator2005]

another great video. can you show us the process of producing a prism? techniques for measuring, scraping, etc. i need a prism to suit my dovetails but do not know how to produce one.

thnx

[MuellerNick]

@billgator2005

Read the comments here carefully, and you'll have answers. :-)

[jeffrey19621]

From America , Ausgzeichnet!

[Wehrmeyer1]

Anderson Scrapers offer a Master like the one you did the flaking on . They offer it as un-machined. So to finish it it would need to be scraped or if is just a casting it would need machining ,stress relief and the scraped.I will look into stress relieving in my area.

[Wehrmeyer1]

I found Cast Iron (grey) 1.5" x 1.5" x 12 " bar. I could then mill the 45 deg face on to the bar. Would I need to have the faces ground or is it practical to start scraping and remove the tool marks that way? As far as the Nickel plating I can have a plating shop chemicaly strip the parts.

[MuellerNick]

@Wehrmeyer1

No, you don't have to grind. But preferably, you stress relief after machining (and then maybe make a finish pass). Contignous cast iron (I think you call that durabar) has very little internal tension, but still I'd stress relief it (if you have the means) before scraping.

[Wehrmeyer1]

I was given a Chinese lathe, a twin to the one you did.I took it because it would cut a metric thread which my other lathe does not. Unfortunately my friend had dissassembled the lathe to paint everything and nickel plate some areas. I have it running and now I am dealing with the plated cross slide. I dont know how a scraper is going to act when it crosses the nickel plated areas.

Can I use steel to make my own prism? I was thinking of using key stock.

Thanks for you work,

[MuellerNick]

@Wehrmeyer1 I never tried to scrape nickel. But I already failed machining it. :-)

Re the prism: Use CI, easier to scrape and better properties transfering the blue.

[petsatcom]

Thanks again Nick. I want to see you do a planer mill.

[MuellerNick]

@petsatcom

I guess that will happen this year. :-)

[DaSmokeDaddy]

Sure wish you lived next door to me and were willing to tutor. grin Thanks for sharing.

[archimedesCNC]

sweet stuff ! Nick,

thanks very much for your efforts & these videos.

Bitte zeigen Sie mehr wieder.

[ebrewste]

Thanks for the video, Nick! I really appreciate them.

[hla27b]

This is awesome Nick! Keep up the good work.

Btw. will you do the whole lathe? That would be something worth watching!!

[MuellerNick]

@hla27b

No, just the top slide, not my lathe. A whole lathe in 10 minutes would be a challenge anyhow. ;-)