Search found 19 matches

by superfrog
Thu May 05, 2016 9:03 pm
Forum: Discussion
Topic: Experiments in aluminium (6082) cutting on an eShapeoko
Replies: 6
Views: 1050

Re: Experiments in aluminium (6082) cutting on an eShapeoko

As an update, with the same 3flute 45degcabide bit a 21kRPM, 3mm deep pocketing with 0.33mm tool engagement at 750mm.min sounds better on the machine (but is about the same removal rate). The chips are absolutely lovely. The same at 1000mm.min clogs the tool. I am wondering whether I am just hitting...
by superfrog
Wed May 04, 2016 1:10 pm
Forum: Assembly
Topic: Why are all the VFD-required spindles 220v?
Replies: 7
Views: 1047

Re: Why are all the VFD-required spindles 220v?

Most of the spindles themselves seem to be rated for 220V too; I assume they mean that the coils are optimised for driving pulses at around this potential. On a 220V AC system, that would save a boost controller and let you get away with straight rectification (Which would give terrible power factor...
by superfrog
Tue May 03, 2016 2:47 pm
Forum: Discussion
Topic: What else should I have on hand?
Replies: 31
Views: 32364

Re: What else should I have on hand?

As nobody mentioned, tapping in aluminium is really easy with a sharp spiral tap in an electric drill/driver with torque control and a reverse gear. Might work with a carbon steel tap too but they are brittle and I generally avoid them in anything that is not very soft or that is worth more than a H...
by superfrog
Tue May 03, 2016 12:14 pm
Forum: Discussion
Topic: Experiments in aluminium (6082) cutting on an eShapeoko
Replies: 6
Views: 1050

Re: Experiments in aluminium (6082) cutting on an eShapeoko

This is a good point, maybe I should get a couple bits from APT and compare. They do look like carbide and feel like carbide density wise. There are so many grades of carbide that it means little anyway. I have been trawling the internets for bits in the past couple months, trying to snatch a good d...
by superfrog
Mon May 02, 2016 5:27 pm
Forum: Discussion
Topic: Experiments in aluminium (6082) cutting on an eShapeoko
Replies: 6
Views: 1050

Experiments in aluminium (6082) cutting on an eShapeoko

Hello people, As Blighty is blighted by clouds and random drizzle and it is a bank holiday (causation/correlation?), I have spent the afternoon playing with my eShapeoko. I have been trying to cut aluminium for a couple weeks and not getting great success at rates that do not involve waiting for the...
by superfrog
Fri Apr 01, 2016 9:10 pm
Forum: Assembly
Topic: eShapeOko, twist around Z
Replies: 6
Views: 1098

Re: eShapeOko, twist around Z

I just redid the wheels with 0.95mm washers (selected from a bag using a micrometer). Light drag can be felt on three wheels. On the fourth wheel, one of the two bearings has a slightly less clean race and gives a bit of a gritty feel, but the assembly is good enough to use for now. The washer were ...
by superfrog
Fri Apr 01, 2016 6:48 pm
Forum: Assembly
Topic: eShapeOko, twist around Z
Replies: 6
Views: 1098

Re: eShapeOko, twist around Z

Upon further examination using a similar attachment method to the previous photos, deflection along the Y axis is only +.04/-0.03 with as small .0.01 dead zone in the middle either way.

I'll report when I manage to redo the wheels with some preload.
by superfrog
Fri Apr 01, 2016 10:20 am
Forum: Assembly
Topic: eShapeOko, twist around Z
Replies: 6
Views: 1098

Re: eShapeOko, twist around Z

In five thousand words worth.

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by superfrog
Fri Apr 01, 2016 12:53 am
Forum: Assembly
Topic: eShapeOko, twist around Z
Replies: 6
Views: 1098

Re: eShapeOko, twist around Z

Ohh, and I am also curious to know whether some of the other DTI wielding members of the community observe similar things on their machines !
There is no reason for any of the other designs to be better ( except for SO3 which appears to have wider Z wheels pacing, which would help some)
by superfrog
Fri Apr 01, 2016 12:50 am
Forum: Assembly
Topic: eShapeOko, twist around Z
Replies: 6
Views: 1098

Re: eShapeOko, twist around Z

While I have the chance, allow me to thank you for the work you did on the eShapeOko. This is a really nice variation on the original machine and I recognise and appreciate the work you have done keeping everything running ( and the MegaRail stuff). Thanks for your offer of bearings, I'll come back ...