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HomeAircraftHelicopterHIROBOOther › Check out my CNC'd Evo Washout blocks!
05-05-2005 09:43 PM  13 years agoPost 21
TMoore

rrMaster

Cookeville, TN

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B.T.D.T.,

A Puma MX2500ST is one of those machines that can only be programmed by an offline system.

I use an offline system to program the Benchman 4000. You can write simple programs to do production parts but the kind of parts like the washout base will require multiple tools, two setups at least, maybe a two vice setup to do the tapped holes, the slots and the circle milled bores for the bronze bushings. The problem with most table top machines with steppers is that they won't mill round holes. Some of the table top machines don't even use G-Code so their programming format is non standard to the industry.

I'll post pics of the next parts for the Freya and X-Spec.

TM

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05-05-2005 10:24 PM  13 years agoPost 22
Bird_E

rrApprentice

Erie, CO

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FWIW
The Washout bases that I made were done on a Sieg X-3 Table top milling machine. I converted the machine to ballscrews and servos. So far the accuracy seems to be very good. My spindle speed is limited to only 2K and I'm still stuggling with surface finish on profiled parts. I believe its just a lack of experience, or me just being too picky!

I have about $1,000 invested in the machine and about another $1,200 for servos, encoders, controllers, power supply etc.....
And a BUNCH of time!
I will try to post a few pictures of my setup later today.


Bob

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05-05-2005 10:26 PM  13 years agoPost 23
B.T.D.T.

rrElite Veteran

NY

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TM,
Thank for the info. I google some of these machines and I got a handful of info. I don't think I can get one of these machines anytime soon.

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05-05-2005 10:49 PM  13 years agoPost 24
TMoore

rrMaster

Cookeville, TN

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Bob,

2K is enough spindle speed. How are you holding the end mills, what kind of end mills are you running? I can get great surface finishes with the Sherline running at 3K just by endmill selection. 3Flute endmills are preferred for aluminum due to the limited spindle speed. Try a 3 flute .25 at 2000 rpm at around 10-20 inches a minute in a climb mill mode. Take a couple of spring passes just to clean up the profile of the part. A little AlumTap on the cutter or WD will help the finish as well.

TM

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05-05-2005 11:00 PM  13 years agoPost 25
Bird_E

rrApprentice

Erie, CO

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Thanks!
TM,
I have been running 4 flute carbide endmills at about 15ipm, I slow down to 10ipm for finish cuts. I was told by a couple of mold makers at work to try 2 flute endmills but they didn't work very good.
Should I use a larger diameter or smaller diameter EM to get a better surface finish at 2K? Or should I speed up or slow down my feed rate?
On these Washout bases I'm taking a .005 finish cut with a Z step down of .050. Does this sound ok?
Thanks!
Bob

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05-05-2005 11:01 PM  13 years agoPost 26
Bird_E

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Erie, CO

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Ooops
Almost forgot, I'm using stadard R-8 collets to hold my endmills.
Bob

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05-05-2005 11:03 PM  13 years agoPost 27
TMoore

rrMaster

Cookeville, TN

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Good, I have an R-8 spindle on my mill too. Most Bridgeport type mills will use R-8.

What endmills and are you using?

TM

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05-08-2005 08:37 PM  13 years agoPost 28
hama

rrApprentice

norhteast, usa

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Bird_E

any updates on the wash-out and radius block sets?

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05-08-2005 10:16 PM  13 years agoPost 29
zoom boy

rrKey Veteran

N.E. Lincolnshire UK

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Will you be doing a set of arms with it?

Also what metal have you used and is it being tested at the moment, ie stress tests?

What metal is it and what price if the arms are done as a complete set?

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05-10-2005 05:41 AM  13 years agoPost 30
Bird_E

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Erie, CO

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A bunch of bases almost done!


I have a small batch of bases almost complete. I need to do a few more operations to each one. I hope to meet everyone request who has expressed interest. This has defintely been more work then I anticipated.... But a good learning experience!

crashed machine, scrapped parts, broken cutters.....etc
Mostly due to my own stupid mistakes!

Thanks!
Bob

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05-10-2005 06:00 AM  13 years agoPost 31
TMoore

rrMaster

Cookeville, TN

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Those parts look real nice, good job.

The crashed machine, broken cutters, fubar'd parts, that's all part of learning. Machining for fun and a hobby is different than making parts for real. The next time you pick up a Hirobo head and look at that satin finish in anodized blue, with no surface blemishes, clean machine work and tight close tolerance fits, you'll appreciate what it took to get there. Not to mention what a bargain some of this stuff really is.

My motto is: If I can buy it I do, if I can't then I consider machining it.

TM

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05-16-2005 09:56 PM  13 years agoPost 32
Tmblewd

rrVeteran

Phoenix, AZ

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Any new info?

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05-16-2005 10:04 PM  13 years agoPost 33
Bird_E

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Erie, CO

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Getting closer!
I working on the radius blocks as well.
Bob

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05-16-2005 10:11 PM  13 years agoPost 34
Jgiang

rrVeteran

Raleigh, the city in the park.... :)

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I want one too. let me know when it ready.


It was in the air, but now it's on the ground. :)

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10-08-2005 08:35 PM  12 years agoPost 35
hama

rrApprentice

norhteast, usa

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any more updates on the washout blocks???

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10-09-2005 07:27 PM  12 years agoPost 36
RPM

rrNovice

Houston, TX

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Washout
Bob -

I'm wating patiently also, whenever you get the package right.

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10-12-2005 03:59 AM  12 years agoPost 37
Paul_Barsamian

rrVeteran

Glenview (North Suburban Chicago)

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hey guys I am doing some CNC stuff as well and had questions about working on aluminum.

Bird-E what size EMs are you using for those washout bases?

I have been doing some alum parts with circular bores like that and they come out very well but I can't seem to get a reasonable ipm speed, I am moving at like 1ipm otherwise I break the bits, and I can only go about .03in depth of cut at a time. I am using 3/32 2 flute EMs. I tried 1/8th carbide 2 flutes and they broke quickly as well.

I am running between 2000 and 2500 on the mill end.

I have a K2 cnc bed with some nice closed loop stepper motors.

I have gotten to the point where I can setup the parts and walk away while the machine runs but it takes between 20-45 min to complete a simple bearing block.

Son, before you can soar with the eagles you have to learn to sh** with the chickens

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10-12-2005 04:36 AM  12 years agoPost 38
TMoore

rrMaster

Cookeville, TN

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Your endmills are too small. Try using a helical motion to mill out the circular pockets and then finish up with a circular interpolated pass to finish. HSS is best for aluminum with your setup due to the spindle speed. .250" for the outside and the inside should work OK. You don't even need TIN coated cutters for this. If you have a low pressure airblast of mist cooler that will help as well.

This part should take anywhere between 5 and 6 minutes to complete. The only thing you will need to do is to flip the part over and mill off the backside, then deburr.

Terry

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10-12-2005 04:43 AM  12 years agoPost 39
the collective

rrKey Veteran

Bayside, NY, U.S.A

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My motto is: If I can buy it I do, if I can't then I consider machining it.
Truer words were never spoken... I wouldn't have believed it a few years ago, but then I bought a lathe...

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11-23-2005 11:58 PM  12 years agoPost 40
Ralphw

rrKey Veteran

Spring, TX

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Any update on the status of these bits?? I'm needing a radius block and washout base for my EVO soonest !!

Ralph W.
"Life's Short, Fly Fast"

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