Joe's 1000x600x200 steel and aluminium router started

[Kitwn]

Joe,
That's looking very impressive.
Clicking on the thumbnails takes you to the larger versions which, on my laptop at least, are sized to fit the screen. Clicking again will enlarge them to what looks to me to be 'actual pixels' size.

Kit

[devmonkey]

Joe,
That's looking very impressive.
Clicking on the thumbnails takes you to the larger versions which, on my laptop at least, are sized to fit the screen. Clicking again will enlarge them to what looks to me to be 'actual pixels' size.

Kit

Hi Kit, I actually meant how to inline images in posts larger than thumbnails, other people seem to be able to do it.

Machined up the Z stepper plate this morning.

[Kitwn]

Hi Kit, I actually meant how to inline images in posts larger than thumbnails, other people seem to be able to do it.

I kind of thought that, but those of us who care enough can see your full detail pictures and you look to be a bit busy with something more important than how big your forum images look!

Kit

[devmonkey]

Gantry extrusion has arrived from KJN, it is a real beast. KJN cutting appears very accurate.



So now I need to decide how to mount 15mm rail to the extrusion. I was considering 3 options:
1. Mount rail directly to extrusion between the two slots, drilling and tapping.
2. Mount rail on aluminium plate which is in turn bolted to the slots.
3. Mount rail directly to slot.

This shows that the profile is not flat across the width which I believe is by design so that the slots pull up to meet whatever you are clamping to them. The slot edges are 0.15mm lower than the centre, the centre and the 2 corners are perfectly aligned within the resolution I can measure with finest feeler gauge.



Now I have the extrusion (1) is a non-starter as there is a very slight peak in the centre and I would need to mill it flat which is hard given the gantry is longer than my mill table, although not impossible.
(2) is what many people seem to do and so obviously works but is more work for me.
Can I get away with (3), see picture below, what do you think?



I have a 50mm fly cutter, it would be possible given the extrusion is already flat and parallel to fly cut between the high points, would have to tram the mill carefully first.

[Tom J]

Hi
Is it SKU IR26526 profile?

No delete option for duplicate post - sorry:(

[Tom J]

Gantry extrusion has arrived from KJN, it is a real beast. KJN cutting appears very accurate.



So now I need to decide how to mount 15mm rail to the extrusion. I was considering 3 options:
1. Mount rail directly to extrusion between the two slots, drilling and tapping.
2. Mount rail on aluminium plate which is in turn bolted to the slots.
3. Mount rail directly to slot.

This shows that the profile is not flat across the width which I believe is by design so that the slots pull up to meet whatever you are clamping to them. The slot edges are 0.15mm lower than the centre, the centre and the 2 corners are perfectly aligned within the resolution I can measure with finest feeler gauge.



Now I have the extrusion (1) is a non-starter as there is a very slight peak in the centre and I would need to mill it flat which is hard given the gantry is longer than my mill table, although not impossible.
(2) is what many people seem to do and so obviously works but is more work for me.
Can I get away with (3), see picture below, what do you think?



I have a 50mm fly cutter, it would be possible given the extrusion is already flat and parallel to fly cut between the high points, would have to tram the mill carefully first.

Hi
Is it SKU IR26526 profile?

[Kitwn]

That's serious looking profile! What total length did you get for your £340.24?

Kit

[devmonkey]

I wasn't that expensive, think it was about £130 plus vat for 1100mm.

[Voicecoil]

Looking at your pic with the straight edge it looks to me that the slope on the inside of the slot is slightly less steep than the slope from the slot to the outer edge. This would mean that your rail would be slightly canted if you go for fixing option 3).

[devmonkey]

You have very keen eyes! Yes at the slot the extrusion is 0.15mm low both sides, since the outside flat is shorter than the centre flat it must be at a slightly steeper angle. I have measured and calculated the cant angle the 15mm profile would have as 0.055 degrees or 198 arcseconds, does this matter (it will be mirrored on the second rail).

Or should I just man up and hit it with this: