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DoESLiverpool somebody should wiki is down #1024

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goatchurchprime opened this Issue Jan 6, 2019 · 2 comments

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goatchurchprime commented Jan 6, 2019

Some server error at github's end that only affects our wiki. Hope they fix it.

Was intending to add this text to the Tool crib page:


Tools are expensive and easy to lose track of. Please number then and record their history as they get used here.

Record who bought them, for how much, where from, catalogue number and any feeds and speeds information provided by the supplier. We want to make sure that when we find a tool we like, we can get it again.

Collets: We have five: 8mm, 6mm, 1/4inch (easily confused), 3mm, 1/8inch=3.175mm (easily confused). You must use the correct collet size and tighten it firmly. DO NOT USE IMPERIAL COLLETS ON METRIC SHAFTS -- even though there is only 5% difference in size, it will jam.

T7 5mm Flat

Diameter 5mm (flat), Collet 6mm, 2 flutes, Alu Power,
Cutwel: E5522050
Bought by @goatchurchprime 11 December 2018 for £13.
Aluminium: RPM 10000rev/min, Feed 1000mm/min, Vc 155 m/min, fz=0.050 mm/tooth (up to 2.5mm deep cutting)

  • 2018-12-31 4 hours cutting at 0.2mm stepdown on full width cuts. Feed reduced to 560mm/min due to noise before it broke. Is capable of G83 drill cycle pecking of 5mm dia hole. There is some wear at the flat tip in the form of shallow notches on the two blades.
  • 2018-01-05 Used for 12 hours over two days, only helix ramping. Beginnings of more signs of wear, but much slower. Compressed air blown at tip to remove swarf has been a major help. Tool collected aluminium twice when speeds were two high and had to be chipped out.

T2

Diameter 3mm (flat), Collet 6mm, 3 flutes, Alu Power
Bought by @mike in 2018

T8

Diameter 6 (flat), Collet 6mm, 4 flutes, HSS
Chinese writing

T9

Diameter 3 (flat), Collet 3mm, 1 flute, Alu Power
Bought by @mike in 2018
Used to quietly drill 50 helixed holes on 2018-01-06 diameter 5, speed 800, spindle 16000 in 10mm thick aluminium.

T10

Holz Alu/Kunsstoff 1mm tools, original with Kinetic-NC machine

T11

Brass coloured rasps 1/8" collet

T12

Full set of 10: 0.8-3mm PCB engraving bits, 1/8" collet

T13

HSS 6mm diameter, long, 4 fluke, 6mm collet
4 remaining, one damaged on shaft.

T14

2 blade, table flattening, 3/4" cut diameter, 1/4" collet
stored in wood.

T15

Case of V-grooved cutters, 1/8" collet, 30 degrees (one unused) for copper or brass.

T16

Case of nearly flat drill bits, 1/8" collet, various diameters for drilling holes in circuit boards.

T17

Case of ball-nose cutters, 1/8" collet and diameter, probably for brass.

Feeds and speeds

my calculations here a 2-fluke 5mm Carbide tool should cut aluminium at 1577mm/minute with the spindle set at 15524rpm, and a 3mm 1-fluke Carbide tool should cut it at 1314mm.minute with spindle 25874.

  • RPM[rev/min] = Vc[m/min] * 1000/60/(3.14 * tooldia) * 60
  • Feedrate = RPM * fz[mm/tooth] * numflutes
  • Vc is velocity of cutting blade as it hist the material (controlled by RPM and tool radius)
  • fz is the width of each chip (controlled the forward motion between one blade strike and the next).

Broken tools

T1 4mm Flat

Diameter 4mm (flat), Collet 8mm, 1 flute, HSS-E,
Cutwel: EL612040
Aluminium: RPM 18000rev/min, Feed 950mm/min, Vc 226 m/min, fz=0.053 mm/tooth
Bought by @goatchurchprime 11 December 2018 for £13

  • 2018-12-28 1 hour cutting swan necks full width at 0.2mm stepdown. Stock came loose on second part and vibrated, heating up everything and melting slivers of aluminium onto the tool, which were picked off.
  • 2018-12-31 Tried with 0.4mm stepdown. Terrible noise after 5mm depth, tore everything apart, and finally snapped.
@johnmckerrell

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johnmckerrell commented Jan 7, 2019

Not sure what that was about but it looks like the wiki is back up now. I'll leave it to you to close this once you've edited the page you wanted to.

@johnmckerrell johnmckerrell added the Online label Jan 7, 2019

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goatchurchprime commented Jan 18, 2019

looks like it got committed, and adrian fixed

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