Need a good table top scrolling CNC!

[asid61]

Originally Posted by RoboChair

We like our 4mm single flutes at 21-24k rpm feeding in aluminum at 45-60 ipm full WOC and a DOC of 0.060"-0.100". We run a super fine mist of WD-40 as coolant so the sacrifice board won't swell.

I uploaded some videos just now to YouTube https://www.youtube.com/playlist?lis...xLLzZmv6MFiAnF

Youtube's video stabilization makes it looks like you have a 5th axis.
Question: is it common practice to conventional mill instead of climb mill on routers, and why if so? It looks like you are conventional milling that video.

[Dale]

At FRC1540 we are just in love with our Shopbot Buddy. Ours is a 2' x 4' version. It handles aluminum and plastic with nary a hiccup.

[Aboudy Dairi]

Originally Posted by asid61

Question: is it common practice to conventional mill instead of climb mill on routers, and why if so? It looks like you are conventional milling that video.

The side of the gussets is being climb milled, while the side of the scrap piece that's being tabbed is conventional milled. At least I think the pieces being tabbed are scrap because there are no holes in them and none of the corners are rounded.

[mman1506]

Originally Posted by asid61

Youtube's video stabilization makes it looks like you have a 5th axis.
Question: is it common practice to conventional mill instead of climb mill on routers, and why if so? It looks like you are conventional milling that video.

I've found that I get a bit better surface finish with conventional milling over climb on a router. Deflection during conventional milling tends to be parallel to the cut rather than perpendicular when climb milling so it doesn't affect the accuracy as much and lessens the chatter marks.

[RoboChair]

Originally Posted by JohnFogarty

Now this post is interesting. Where can you buy the cheaper Chinese spindle?
I'm pretty sure I might go the Velox route.

eBay, just search CNC router spindle

Originally Posted by Aboudy Dairi

I noticed this on their website too, but is it mandatory to send a computer to their shop in order to install software?

No, but it does mean what you receive will have been tested as working at their shop before it leaves. They ran into issues installing on our an we had to set it up ourselves at our shop, would not recommend do it unless you have someone really familiar with networking and CNC setup.

Originally Posted by Frank Neuperger

Robochair,

What tolernaces (in aluminum) are you achieving with your velox setup?
Have you benchmarked your machine for accuracy or repeatability?
i.e. using an indicator , have it return to a reference surface in each of the 3 axis.

Does your CAM or controller allow you to map your lead screw to enhance accuracy? If so, how many points will it allow?
Did you have to adjust scale in any of the 3 axis after you set up the machine?
One or 2 lead screws to move the gantry (low axis) ?
Do the anti backlash nut assemblies require maintenance or periodic adjustment?
Also, which model and size Velox did you buy for $6k?

It makes gearboxes every time so I never felt the need to measure it out, but for sure under 2 thou when done with a finishing pass.
+- 1 or 2 thou, we operate the machine off of a work coordinate system saved in the machine. So that repeatability is based off the zeroing to the sensor switches, the machine is tighter than that.
Yes it does, but the leadscrew nuts are all backlash compensating anyway there is no need to tune the settings to avoid backlash.
No we did not.
Yes the Y-axis has 2 screws and can be zeroed to the switches separately while unpowered to square up the gantry.
The lead screws need to be oiled often so they don't sound like Chewbacca sounding a battle cry, other than that nothing else.
The 4x4(50"x50") model.

Originally Posted by asid61

Youtube's video stabilization makes it looks like you have a 5th axis.
Question: is it common practice to conventional mill instead of climb mill on routers, and why if so? It looks like you are conventional milling that video.

We only climb mill.

Originally Posted by Aboudy Dairi

The side of the gussets is being climb milled, while the side of the scrap piece that's being tabbed is conventional milled. At least I think the pieces being tabbed are scrap because there are no holes in them and none of the corners are rounded.

Correct sir.

EDIT: In regards to a prior post I rechecked our invoice and the default Educational Discount is 10%, not the 5% I listed.