Fun, Learning, Friendship and Mutual Respect
START  HERE


Unregistered
Go Back   HeliFreak > R/C Helicopters > CAD/CAM


CAD/CAM R/C Helicopter CAD/CAM


Reply
 
Thread Tools Display Modes
Old 05-03-2011, 03:21 PM   #1
CyberPlainsDrifter
Registered Users
 
My HF Map location
Join Date: Apr 2011
Location: Burnaby British Columbia - the most expensive place on earth!
Default Carbon Fiber cutting Feed/Speed values ?

Hi Guys,
Ive got a client requesting me to cut some CF. Seems like he has multiple peices...


Anyone have some good feed / speed values to start out?

Material I think is 3/16th thick (bullet proof?!?!?) and If possible Just to cover the bases,
Im looking for values related to:
1/4" tungsten bit
1/8" tungsten bit
1/16" tungsten bit

I suspect that in order to reduce material fraying , a straight fluted bit should be used...But single double triple or quadflute is also a question..

I wont even mention diamonds... I think this -even though its the right tool for the job, it has been priced far out of reach at this juncture...

Ive got the machine and a good mask.. I just need some math..

Thanks in advance...

If I can get to the bottom of this, I will be considering making parts for our hoby too. Not just carbon but various palstic parts too.. "made in North America"

Regards, Rich.
Attached Thumbnails
Click image for larger version

Name:	DSCN0457.jpg
Views:	566
Size:	75.1 KB
ID:	225767  
CyberPlainsDrifter is offline        Reply With Quote
Old 05-06-2011, 06:25 PM   #2
TMoore
Registered Users
 

Join Date: Apr 2004
Location: Cookeville, TN
Default

What HP spindle do you have available, how tightly can you hold the workpiece and when you say Tungsten, do you mean Carbide?

TM
TMoore is offline        Reply With Quote
Old 05-06-2011, 09:10 PM   #3
CyberPlainsDrifter
Registered Users
Thread Starter Thread Starter
 
My HF Map location
Join Date: Apr 2011
Location: Burnaby British Columbia - the most expensive place on earth!
Default

Yep, Tunsten Carbide bit. (High Rockwell bit) and I can clamp the work down as much or as little as needed.

Diamond bits are supposed to be the cats a$$ but pricy.

The spindle I use is an HSD (made in America!!!) 5HP 3 phase. 3000-24000 rpm. Amazingly quiet at 24K! Has ceramic bearings...

Got any speed/feed values?

Im starting to get the impression that I am going to have to simply do some of my own testing.. Not a lot of info out there and the people who do have info seem to be apprehensive about giving it up.. Like its a big secret or something... Anyway that could just be my own brain feeding me disinformation....

Cheers, Rich.
CyberPlainsDrifter is offline        Reply With Quote
Old 05-06-2011, 10:51 PM   #4
TMoore
Registered Users
 

Join Date: Apr 2004
Location: Cookeville, TN
Default

For one thing the stuff cuts like butter but CF is abrasive so that will determine the F/S that you can run the cutter at because it will wear out not from cutting pressure but from the abrasiveness of the material.

Start with a .125" cutter at full depth, 7500 rpm at 15-20 ipm. This isn't very fast and I would start with the Feedrate override down at 50% and ramp it up with a little air or vacuum in the zone. After you get a feel for the cutting action, I would say you could triple the speed and feed without splaying the material if the machine is rigid enough.

TM
TMoore is offline        Reply With Quote
Old 05-06-2011, 11:17 PM   #5
CyberPlainsDrifter
Registered Users
Thread Starter Thread Starter
 
My HF Map location
Join Date: Apr 2011
Location: Burnaby British Columbia - the most expensive place on earth!
Default

Thank You Mr. Moore.

I will attempt a cut at your suggestion. See where it ends up. I had a figure in my head of about 21000 @ 60 ipm... Your figures and my figures jive.. So maybe I was in the ballpark all along...

Thanks again for your inputs! Much appreciated.

Regards. Rich
CyberPlainsDrifter is offline        Reply With Quote
Old 06-11-2011, 12:00 PM   #6
CaptainIncompetent
Registered Users
 

Join Date: Jun 2011
Location: MA
Default

I think TMoore has suggested a good place to start, but keep in mind that a CF (or any FRP) layup is anisotropic to a degree that few other materials are, so expect to spend some time and material on experimentation.

Probably not helpful if you only have a mill, but if it's just flat sheet, waterjet really is a better choice for this.

Good luck!
CaptainIncompetent is offline        Reply With Quote
Old 06-11-2011, 07:34 PM   #7
TMoore
Registered Users
 

Join Date: Apr 2004
Location: Cookeville, TN
Default

A water jet is completely unusable in CF. The jet splays the CF at the cutting zone and it delaminates. I sell WJ's and I've tried it on the stuff that I've sold in the past and it is not workable.

TM
TMoore is offline        Reply With Quote
Old 06-12-2011, 11:06 AM   #8
CaptainIncompetent
Registered Users
 

Join Date: Jun 2011
Location: MA
Default

I've had good results having CF cut via waterjet, but I emphasize the disclaimer that there is huge variation in layups, so ymmv.
CaptainIncompetent is offline        Reply With Quote
Old 06-15-2011, 12:46 AM   #9
X-Gear
Registered Users
 
Posts: 254
 

Join Date: Feb 2009
Location: Oregon
Default

I just cut a 1/4" thick kevlar and carbon layup for some college kids with our waterjet and it turned out very well. There was no delamination, there was a touch of fur along the edges, but there was no delamination of any of the layers.
__________________
To all of the active duty soldiers, the M.I.A. and the K.I.A., Thank you for all of your sacrifices that let us enjoy the freedoms that we have.
X-Gear is offline        Reply With Quote
Old 06-15-2011, 01:35 AM   #10
TMoore
Registered Users
 

Join Date: Apr 2004
Location: Cookeville, TN
Default

.25 is easy to cut compared to 2mm. Try it and see the result. I've never used .25" CF for Frames.

TM
TMoore is offline        Reply With Quote
Old 07-05-2011, 01:11 AM   #11
rcflyerheli
Registered Users
 
Posts: 1,899
 

Join Date: Apr 2010
Location: Granbury
Default

Go to Harveytools.com. They manufacture bits of all kinds and sizes. Their website has the basic formulas for feed rates based on material/bit parameters.
__________________
Goblin 700, Trex 700 V2, Trex 700DFC, Gaui X7, Logo 600SX, Logo 690SX, Forza 700
Trex600EFL Pro, Trex 600 ESP, Trex 500 ESP, DJI 550
Amain Team
Rep
rcflyerheli is offline        Reply With Quote
Old 07-06-2011, 01:41 AM   #12
CyberPlainsDrifter
Registered Users
Thread Starter Thread Starter
 
My HF Map location
Join Date: Apr 2011
Location: Burnaby British Columbia - the most expensive place on earth!
Default

That is a great link! Everything there to get a guy goin'
Thanks alot...

My latest project was for a Trex500 I cut some rudder control rod guides for a bud at teh field.. check out the photo..

Thanks for the great info guys!

@Tmoore The .25 was for a custom tool/projector mount.. nothing to do at all with Heli's. I got a really sweet piece of 1/16 CF today.. Im going to cut some parts for my Mcpx and 250..

So with the formulae that are available at Harvey tool , this should be a cake walk!
Attached Thumbnails
Click image for larger version

Name:	_MG_1646small.jpg
Views:	361
Size:	51.1 KB
ID:	238689  
CyberPlainsDrifter is offline        Reply With Quote
Old 06-27-2016, 08:56 AM   #13
kustom20
Registered Users
 

Join Date: Jun 2016
Location: Australia
Default Carbon Fibre Cutting

Hi All,

I noticed this old thread and wanted to add some input maybe of some help for anyone milling carbon sheet.

Material Sheet Thickness 2.0mm
Rotary Burr Cutters - normal single 2 flute 3 flute etc end mills can cause delamination and pull fibre strands

1.4mm 1.5mm 1.6mm 3.175mm cutter diameter we run at 100mm per minute 3.0mm depth cut - 20,000rpm (1.0mm below material thickness)

Material spaced 3.0mm above milling table with 3.0mm plates in each corner - this allows 2.0mm material to drop below the lowest part of material and cutter depth - t-bolt clamped in each corner

Material submersed underwater for cutting - not cutting fluid.

The final finish is excellent, the resin stays in tact and no excessive heat due to water, no delamination, no strands of fibre uncut, no whiskers so to speak, and no dust in the air keeping it all contained in liquid.

We could ramp the speed of 3.175mm up to 200mm per minute but we get a slightly lower cut quality on the edge.

We have cut 2.0mm sheet at 400mm per minute with 3.0mm cutters but we prefer a better finish quality on the edge produced by slower feed.
kustom20 is offline        Reply With Quote
Reply




Unregistered
Go Back   HeliFreak > R/C Helicopters > CAD/CAM


CAD/CAM R/C Helicopter CAD/CAM

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


Copyright © 2004-2016 by RCGroups.com, LLC except where otherwise indicated. The HeliFreak.com logo is a trademark of RCGroups.com, LLC.