Howdy,

Today we do get to give the SheetCutter a test run. But first the last fabrications.

Cutting notch in the rear clamp riser.

[IMG]http://downloads.purposebuilt.com.au/NJB/SheetCutter/G_LastFabrications/LastFab_01.png[/IMG]

The "portion" of 14mm round bar that I had "selected" for the swivel plate shaft wound up (on inspection when it would not fit) being 14.3mm of hot rolled bar that was none too round.

So dug out a length of 16mm round bar of unknown type and off to the lathe for trim to size. Whatever it was it was very "chewy" and I was lucky to get a finish as good as I got.

[IMG]http://downloads.purposebuilt.com.au/NJB/SheetCutter/G_LastFabrications/LastFab_02.png[/IMG]

I had this picture so I thought I'd post it. It shows use of an edge finder for setup in mill. I find if I run the edge finder at about 500 rpm and get it to sit just about as in the picture I will be a good read.

[IMG]http://downloads.purposebuilt.com.au/NJB/SheetCutter/G_LastFabrications/LastFab_03.png[/IMG]

The next two holes are going to be 3.5mm; so give it a good wind to 3000 rpm to get the surface feet per minute (SFM) at tip of drill to the "right" value.

[IMG]http://downloads.purposebuilt.com.au/NJB/SheetCutter/G_LastFabrications/LastFab_04.png[/IMG]

Just a "touch" here with a stiff drill (center drill) to get a wee dent on the curved surface to guide the next drill.

[IMG]http://downloads.purposebuilt.com.au/NJB/SheetCutter/G_LastFabrications/LastFab_05.png[/IMG]

Running this 3.5mm (0.13") drill at the 3000 rpm gave chips like so.

[IMG]http://downloads.purposebuilt.com.au/NJB/SheetCutter/G_LastFabrications/LastFab_06.png[/IMG]

Then a larger center dill (cutting at the 60 degree edge) to create a chamfer.

[IMG]http://downloads.purposebuilt.com.au/NJB/SheetCutter/G_LastFabrications/LastFab_07.png[/IMG]

Drilled hole in swivel plate for the shaft.

[IMG]http://downloads.purposebuilt.com.au/NJB/SheetCutter/G_LastFabrications/LastFab_08.png[/IMG]

Decided on this setup to hold the shaft "squarish" on the swivel plate. In this shot you can see the chamfer in the retaining pin hole made with the center drill.

[IMG]http://downloads.purposebuilt.com.au/NJB/SheetCutter/G_LastFabrications/LastFab_09.png[/IMG]

Gave it a good weld in 4 stages. Left side, right side, top side, bottom side. It did come out acceptably square.


[IMG]http://downloads.purposebuilt.com.au/NJB/SheetCutter/G_LastFabrications/LastFab_10.png[/IMG]

This porkupine looking creation was the rig to hold the portion that made up the frame for the grinder. I only tacked them.

[IMG]http://downloads.purposebuilt.com.au/NJB/SheetCutter/G_LastFabrications/LastFab_11.png[/IMG]

Made up the clamp screws. They were not made from "all thread"; but very similar old adjuster for a motor mount. They are 12mm. Drilled a 5.9mm hole for the 6mm handle; this hole should have been larger but it was the closest "undersize" drill I had. The 6mm handle took a bit of a smack with the hammer to get them started and I guess as the metal could stretch some I worked out ok.

[IMG]http://downloads.purposebuilt.com.au/NJB/SheetCutter/G_LastFabrications/LastFab_12.png[/IMG]