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91
How do I?? / Re: Gib Strip for a Capco Surface Grinder
« Last post by Pete. on May 25, 2017, 03:17:53 PM »
Just buy the 3/8 cold rolled strip, mill the angles, scrape the working face for oil pockets and fit it. I did this on a lathe recently and it worked out fine.
92
Metal Stuff / Re: Aluminum Copper Alloy Experiment
« Last post by Pete W. on May 25, 2017, 03:02:54 PM »
If you really want a hard alloy try Beryllium with Copper. Itís used to cover expensive golf clubs and can be used for armour piercing bullets!
 

Years ago, I had occasion to visit an aircraft company in the UK midlands.  There was a detached laboratory on the site, surrounded with a tall security fence.  Occasiomally, one or two of the staff could be seen outside the building, all clad in 'space suits'.  On enquiring of our hosts 'what's that all about?' we were told 'that's the Beryllium research department'.  My understanding is that beryllium's not very nice stuff, even alloyed (e.g. beryllium copper) or in the ceramic form (beryllia) used for semiconductor heat-sinks. 
93
How do I?? / Re: Gib Strip for a Capco Surface Grinder
« Last post by PekkaNF on May 25, 2017, 02:27:52 PM »
Gib can be banana when it is that slender. But the cross section must stay constant. My friend just ordered spare for one milling machine and spent two weekends scraping it.

Can you use the grinder table (bolt it onto milling machine table) and use that as a jig to mill the gib? If you clock the "jig" or table straight you can move the gib, clamp it against the dovetail and mill the top with endmill with reasonable accuracy.

I wonder if I can explain it right: You size the stock to right flatness, then you have a square bit. Then you clamp this square stock into the dovetail using roll pin or whatever means necessary. Now you are offereing it to the end mill at correct angle, because it is in the dovetail in situ. You mill the top straight (it will be proud of the dovetail, because you have unwanted corner at the bottom), then you shim bottom at the dovetail, put this gib strip atop of the shim, clamp, and mill this other side. I may need to resor drawing (suck at it).

I would not use any type of tilting vice on this long/slender piece. You will be fighting a lit to get the setup repeatable.

Pekka
94
CNC / Re: Cetus3D 3D Printer
« Last post by Joules on May 25, 2017, 01:48:38 PM »
LOL, as I have pretty much preached from the start, even my kit built printers are a lot more work than the ready builds.  If you have end uses, don't waste time reinventing the wheel, though I keep getting drawn to the dark side.

Roll on the Cetus3D being available in the UK from a dealer.
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CNC / Re: Cetus3D 3D Printer
« Last post by DMIOM on May 25, 2017, 01:35:42 PM »
.......The quality of the print is down to the machine and  the Fusion 360 software

And the operator, Andrew!
96
How do I?? / Gib Strip for a Capco Surface Grinder
« Last post by philf on May 25, 2017, 01:30:49 PM »
I recently bought a bargain Capco surface grinder aptly described as a project.

There were many bits missing or not quite right but most could easily be made (and mostly have been).

The one part I'm having difficulty with is the gib strip for the main slide which was missing.

It's 640mm long, 9.5mm thick with 55 degree angles.

If I start with 1" x 3/8" cold rolled mild steel it'll no doubt ending up like a banana when I machine 1 of the 55 degree angles.

I thought of taking off a very small amount on one side and then the other to try to balance things out but this will take forever. My angled vice has only 4" jaws so any machining will be have to be in 5 or 6 steps.

Hot rolled steel might distort less but will require the sliding face machining and I'm limited to 300mm travel so again I can't do it in one go.

Anyone got any bright ideas?

Cheers.

Phil.
97
CNC / Re: Cetus3D 3D Printer
« Last post by awemawson on May 25, 2017, 01:05:32 PM »
Joules,

From you I take that as a great compliment, but to me it confirms the decision to buy a printer rather than faff around for weeks trying to get a home brew up and running.

The quality of the print is down to the machine and  the Fusion 360 software
98
CNC / Re: Cetus3D 3D Printer
« Last post by Joules on May 25, 2017, 12:49:47 PM »
My work here is done, now any Tom, Dick or Andrew can 3D print quality stuff     :thumbup:
99
CNC / Re: Cetus3D 3D Printer
« Last post by Pete. on May 25, 2017, 12:17:23 PM »
Not surprised, that's bloody good.
100
Metal Stuff / Re: Aluminum Copper Alloy Experiment
« Last post by awemawson on May 25, 2017, 11:35:13 AM »
 :clap:
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