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Articles related to CNC Setup and Machining Techniques

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Pictures of Nested Parts

December 9, 2012, 6:10 pm by Eldar Gerfanov

Here are some samples of nested parts i did recently

In both cases back of all pieces were machined at the same time, dowel holes milled so that there would be a way to align top and bottom.

Ealot of material was lost, but it was a scrap anyways, so all i gained was alot of saved man-hours.

Photobucket

And here are 4 more pictures:

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What to do when you can not clamp it

September 28, 2012, 12:51 am by Eldar Gerfanov

If you cant, then dont clamp it at all!.
Skin it!

In here i have to program and machine several sets of roundish aluminum pieces with +/-0.001" outside tolerance. and within 0.002" thickness repeatability.
Instead if fixturing it one by one i decided to skim cut a 33" x 23" x5/8" to within 0.0015 flat. And then machine each piece completely leaving .005" outside to holt everything together.

Worked out great. 

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Shop-made indexing fixture

September 28, 2012, 12:32 am by Eldar Gerfanov

Needed to do alot of side drilling/milling/tapping on our moulds lately.

So I quickly designed and whipped up this custom indexing fixture that allows me to mount almost anything to it.

Face plate has several tooling dowel holes on front side to locate work piece.
On the back of face plate there are 36 3/8 dia reamed holes spaced 10 Degree apart.

Housing has a big 5.0"Dia pocket in the front into which the face plate's hub fits in with 0.001" clearance
Housing also has corresponding 3/8dia reamed holes spaced apart 9 degrees. This allows me to index the face plate with 1 degree increment.

Design time:2 hours, Machining time: 2 hours.

Pictures are here:

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FS Wizard: Dormer Drill test on T6061 Aluminum

April 23, 2012, 8:22 pm by Eldar Gerfanov

As part of FS Wizard's development. 2 drills were tested today on T6061 Aluminum.

0.312 Dia and 0.390 Dia Dormer A002 Drill Jobber Drill with TiN coated tip.

Helix:30Deg

Point:Split, 118Deg.

Hole depth for both was 3.0"".

Peck equaled 1xDia

Speeds and Feeds for 0.312 Dia drill were

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Drilling Hardox 500 55RC: 0.281 dia .75 deep

April 20, 2012, 1:47 am by Eldar Gerfanov

Tool:0.281 dia 0 helix TIN coated carbide drill

Peck:0.125

Coolant: Air

RESULT
SFM: 49 f/min
RPM: 663
APT:  0.00070 in/rev
Feed: 0.93 in/min
MRR: 0.1 in^3/min
HP: 0.2
Torque: 19.4 in-lb
Max Torque: 22.9 in-lb

 


Test of NIAGARA 3FL HP End mill for Aluminum

February 27, 2012, 11:02 pm by Eldar Gerfanov

Recenty ordered a 3Flute High Performance End Mill From NIAGARA.
Was very glad and slightly surprised that when punched in all of the endmill's data into my Calculator nothing broke down.I had a rason: At 5000RPM and 3/8" Deep slot cut. The feed came to around 92.0IPM. Chips were making this nice ringing noise that sounds like money.

Setup:
HAAS VM-3
Hudrolic Tribos Holder
3/4" 45DegHelix 3Flute 1.625FluteLen, 2.375"Overhang TICN HP End mill

S:5000RPM
F:92.0IPM
DOC: 0.375" Slotting
Coolant:FLOOD

The calculation was pretty much dead on.


Tapping Hardox Rc 45-50

February 27, 2012, 10:43 pm by Eldar Gerfanov

A need arouse to drill and tap lots of blind 1/4-20 holes in 3/4" thick hardox 45-50RC hard plate.

So if you ever need to do this use:

1) DRILL
Tap hole: >0.202" or bigger.  5/8 deep.
Drill used: Tialn coated carbide drill.
S=1418 RPM
F=2.6 IPM
NO Peck, No Coolant

2)TAP
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HAAS: Making G54-G59 show Z0 at the top of fixture

November 29, 2011, 11:50 pm by Eldar Gerfanov

Problem: Work offset G54 Z0 shows some "weird number" which is very hard to relate to.

Can we make top of fixture show Z0=0.000 ?

Solution:

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Milling Hardox Steel Rc 45-50

January 26, 2011, 11:17 pm by Eldar Gerfanov

Out Company used to have somebody else plasmacut cutting anvils for us.
This was expensive, plus heat generated by plasma caused already unstable anvils to warp like crazy making them very hard to grind flat.

So when foreman told me to machine one on CNC i immidately asked him to buy one of those nifty Hanita TiALN coated Varimill cutters.
Too bad they are too expensive. So the company bought same style of cutters made by Niagara. 0.5" end mill there is x3 cheaper than hanita's. Plus i believe cutting tools made to the same specs, out of the same materials are performing identical.

The machine we ve been using for this is really shaky and busted, so dont laugh at speeds and feeds that we came up with.

So basically, Specs Are:

  • Material: Hardox pre-hardened steel Rc 45-50
  • Cutter: 4 Flute, Stagger Flute TiALN coted 0.5" Micrograin Carbide End Mill, 2.5" Overall, 0.625" Flute Length, 1" overhang
  • Operation: Slotting
  • Speed: 1200 RPM
  • Feed: 4.8 IPM
  • Depth OF Cut: 0.125"
  • Plunge method: 2.5 Deg Ramp/Helix, Or Plunge into 0.281Dia pilot hole at 3 IPM
  • Coolant: Airblast + Oil

Drilling Hardox steel Rc 45-50

January 26, 2011, 11:16 pm by Eldar Gerfanov

Lately we've been doing alot of anvils out of 3/8 or 1/2" Hardox steel (Rc 45-50)
Aside from having to machine profiles and pockets we also have to drill some mounting holes.

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