Thread: Beavermill conversion to CNC
Today I did the scraping of the X axis.
I've needed the whole day for it and tomorrow I will also have a few hours
to do before it is ready.
I'm still not done scraping on the X axis it takes more time than I thought
anyway I continue until everything is straight.
This week I am planning to order the servo's This week from Zapp automation
I think the set servo motors from 1000 watt hopefully they are strong enough
It's looking good Andre,
I've never owned a machine with hand-scraped surfaces - will do soon though I hope. Just out of interest, the X axis bearing surfaces look quite long (it looks maybe 1500mm?). What are you using as a flatness reference to scrape this surface?
It is 1400 mm long and I have a special tool that I can use .
I will tomorrow make a picture and show you.
This is the tool that I talk about .
There are many shapes and designs available.
Or if you are in possession of a flat table, you can make one yourself.
Are you planning to scrape your own machine?
I can only say one thing "patience"
Thanks for the pics. Actually I was just curious about how to stabilise the flatness over such a long and thin shape. Of course a triangular section is obvious to me now! :)
My machines do not yet deserve scraping. In the UK we have a phrase "making a silk purse out of a sow's ear". It means that I could try for a long time with lots of sewing to turn a cow's ear into a silk purse. In the end, maybe it would look a bit like a silk purse. But actually it would always be a sow's ear!
It's the same with my cheap lathe! :) I'll save the scraping for another lathe...
I had thought about making a small flatness reference by scraping 3 plates into each other - but that would take a long time too!
I have spent the last days designing the axial bearings
and have done research for which
configuration I am going to use.
I had first thought of using a ZARN type of bearing .
But they were too expensive .
So I made my own a design with two axial needle bearings and one radial needle bearing.
Then I have the same result as the ZARN bearing.
I can preload them as I want.
Today I received the CNC handwheel.
We finally have finished scraping bearing surfaces on the X axis.
I decided to start from the basics because I had discovered that the table
was bend at the ends about 0.4mm on both sides.
I will show pictures of what I did to get it right.
Maybe something that someone can use it for his own project.
The first thing I did was to facemilling the carrier.
Then I milled the pigeons tail .
Then I finished it on the granite block with the scraper.
So this is straigth.
I will show you the tools aswell.
1 small scraper and 2 larger tools.
Then I focused my attention on the table and have them placed on the milling table with a hoist because it weigh about 150kg and that is a bit heavy to manually manipulate.But first I have them measured and marked points with the correct height and recorded them on the piece.
I then aligned them both height and direction .
Next I face milled both sides and the top because the top surface was not straight olso.
After aligning the table under the correct angle with a 3d measurment device I milled the pigion tail .
Later I scraped the surfaces again .
The end result is a maximum of 20 microns difference over the full distance 1420 mm
both the flat faces and the pigion taile.
For checking the flatness I used a clock and a triangle block for scraping and for the pigion taile a micrometer and 2 cilinders .
And I use for scraping the Prussian bleu oilpaint to see what I did
otherwise you will not know where to remove matarial.
Last edited by Andre; 15-12-2009 at 06:43 PM.
this is the triangle schape
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