Calibrating for Ipê

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WillAdams
Posts: 8489
Joined: Mon Apr 09, 2012 6:11 pm
Location: Pennsylvania --- south of the Turnpike, East of US-15
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Calibrating for Ipê

Post by WillAdams » Sat Jun 07, 2014 5:44 pm

Picked up 19 linear feet of Ipê at Bristol Valley Hardwoods in New York state (wonderful lumber yard --- highly recommended --- be sure to keep an eye out for Libby, the ``office manager'' she's wonderful) when I went to pick up my daughter from college --- gorgeous stuff, but incredibly hard / dense.

Cuts beautifully though. Decided to try the Precise Bits folk's technique: http://www.precisebits.com/tutorials/ca ... speeds.htm

and coded up a simple file:

Code: Select all

G17 G21 G90

G0 X0 Y0 Z3

G0 X6.35 Y3.175

G1 Z-3.175 F150 (20 percent of feed rate)

G1 X38.1 Y12.446 F750

G1 X6.35 Y21.717 F875

G1 X38.1 Y30.988 F1000

G1 X6.35 Y40.259 F1125

G1 X38.1 Y49.53 F1250

G1 X6.35 Y58.8 F1500

G1 X38.1 Y68.07 F1625

G1 X6.35 Y77.345 F1750

G0 Z3

G0 X0 Y0
which resulted in the following test cut:

Image

So it looks like something a bit less than 750 is the hot ticket --- 562.5 or so --- now I just have to edit / update my file to match that.

and... it looks like climb cutting is best.

(This was on my SO1, w/ Harbor Freight 1/4" Trim Router and a Garr Tool Series 1/8"x3x1" bit at full speed (~26,000 R.P.M.)
Shapeoko 3XL #0006 w/Makita RT0701 Router w/0.125″ and ¼″ Elaire precision collets
Nomad 883 Pro #596 (bamboo)

WillAdams
Posts: 8489
Joined: Mon Apr 09, 2012 6:11 pm
Location: Pennsylvania --- south of the Turnpike, East of US-15
Contact:

Re: Calibrating for Ipê

Post by WillAdams » Sat Jun 07, 2014 10:50 pm

Well, everything that could go wrong did:

- one end of a belt came loose, then the other three ends of the Y-axis --- sequentially
- tripped the circuit breaker on the power strip 'cause I had the vacuum cleaner plugged into it
- didn't notice that the fan for the microcontroller didn't spin up, so lost steps on the last try
- managed to break a bit moving the gantry by hand trying to set up for another try
- vacuum cleaner overheated on the last run
- and finally workholding came loose on my last attempt, leading me to call it quits for the day

Other than that, cutting the stuff worked out fine, but I don't have anything worth showing.

Will probably just switch to trying to cut out a bow (I was trying to cut the circle-diamond-square test).
Shapeoko 3XL #0006 w/Makita RT0701 Router w/0.125″ and ¼″ Elaire precision collets
Nomad 883 Pro #596 (bamboo)

Tom Smith
Posts: 297
Joined: Mon Apr 09, 2012 9:55 pm
Location: North Vancouver, British Columbia

Re: Calibrating for Ipê

Post by Tom Smith » Sat Jun 07, 2014 11:40 pm

Ouch. The universe is trying to tell you to do something else today, methinks :-)

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Marty M.
Posts: 66
Joined: Sun Feb 09, 2014 3:42 pm

Re: Calibrating for Ipê

Post by Marty M. » Wed Jun 11, 2014 4:23 pm

I live a couple miles down from Bristol Valley and made some deck post caps out of IPE work on my CNC .... That stuff is like working with steel. I still find the dust in the shed and it's been a couple years. Wear a dusk mask!

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