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HomeAircraftHelicopterCAD - Engineering - Technical › Maxcn15 or Sherline
05-03-2005 03:29 AM  13 years agoPost 1
totSandman

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Still Unkown

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Hello
I'm looking into picking up a cnc mill . So far the Maxcn15 and the Sherline 2100 fall into my price range.
Has anyone here used either of them and if so what do you think of them .
Witch one is the better of the two . I'm looking at mostly cutting 6061 T6 and 7075 aluminum. Also i am very familiar with G code but I am just now starting to play with cad software so witch one of the two do you thing is more user friendly .

I also kind of like the TAIG but I don't thing is has the 4th axis option can anyone tell me something about it as well .

Thank you .

Blade400 2221-8, DS285MG ,Spartan DS76,Jr3400G ,CC35 ESC ,CC10amp BEC/ T-Rex 500 lots of upgrades

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05-04-2005 02:19 AM  13 years agoPost 2
TMoore

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Cookeville, TN

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The Max has aluminum ways. The Sherline is a nice little machine, I have two of their manual machines.

The biggest difference in little machines is whether they are using servos motors and ball screws or stepper motors and leadscrews. Servos and ball screws are the better solution. Having said that, steppers will work but you won't get the surface finish that servos and ballscrews will give you.

It is a tough choice and you will have to do a lot of research to find the right machine. Here's a test for you to have any manufacturer perform prior to buying their machine. Have the machine cut a Euclid block or the Circle, Diamond, Square test and measure the block. This willl tell you a lot about the machine.

TM

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05-04-2005 02:48 AM  13 years agoPost 3
totSandman

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Thank you for the info

Blade400 2221-8, DS285MG ,Spartan DS76,Jr3400G ,CC35 ESC ,CC10amp BEC/ T-Rex 500 lots of upgrades

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05-04-2005 03:23 AM  13 years agoPost 4
PaulH-MA

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Boston, MA

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I'm familiar with both of these machines.

The MaxNC was designed from the beginning to be operated as a CNC mill. The Sherline is a converted manual mill. There are pros and cons to each.

Consider also that all machines in this price range are going to use all-thread rods with wear-compensating anti-backlash nuts and stepper motors. Only the high-end machines will use ball screws and servos. A single servo can easily cost $300 and as high as a couple thousand, depending on its ratings.. Ball screws are similarly expensive.

--Paul

TREX 450
Bergen Intrepid Gasser x2

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05-07-2005 05:31 AM  13 years agoPost 5
TMoore

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Cookeville, TN

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Like I said, cut a Euclid block or circle, diamond square and check the results. You will be amazed at how poorly these little stepper motor machines really perform. I'm not saying you have to have commercial quality but if you bide your time and start out with a Sherline manual mill you can learn the basics and then move up to something else.

I turned out a lot of work on manual machines early in my career and nothing has really changed that much.

TM

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05-07-2005 02:47 PM  13 years agoPost 6
OT45

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Kingston, NY

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TMoore,

I like the pics of your benchman in your gallery. Could you share with us the price range a nice set up like yours falls into? I did not notice an ATC. Does it have one? Between the smaller machines listed by totSandman which has the better spindle?

scratch building is not just for planks

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05-07-2005 03:16 PM  13 years agoPost 7
TMoore

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Cookeville, TN

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Thanks OT.

The Benchman isn't made any more but you can pick up used ones for less than $7,500.00. A nice used one with a 4 station ATC just went for less than 7K. I didn't need the T/C for what I'm doing presently.

The spindle is an R-8 which is a standard knee mill spindle and works well for the intended purpose of this machine which was to 3D mill graphite electrodes. This machine is what is known as a Rod and Rail machine. The base is polymer concrete and the bearing ways are Thompson linear rails with precision ground ball screws. Polymer concrete is used extensively in the machine tool business.

My machine uses air blast to cool and blow chips from the cutting zone. I purposely limit the spindle to 5000 rpm unless I'm using really small cutters for 3D profiling and then I run it at 10K.

Most of the programming is done with a mixture of Featurecam V12, EZ Cam V14.5, DP V9C or DP Esprit W. I also use several engraving packages that are rather pricey.

The Sherline has a pretty good spindle. It will run at 10K and I have done so and it runs warm but not to worry. I don't know a lot about the Max to be honest. There is a Yahoo Group dedicated to the Max and you will want to check it out. Users will be the first to point out the machines shortcomings.

I can do a lot on the Sherlines. If you use the rotary table and some creative fixturing you can make a ton of parts. The practice will make you a better machinist.

TM

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05-07-2005 04:05 PM  13 years agoPost 8
OT45

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Kingston, NY

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Thanks for the info TMoore. I'm not familiar with polymer concrete. Is this a product that one could cast themselves? Good price on your purchase.

scratch building is not just for planks

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05-07-2005 04:13 PM  13 years agoPost 9
TMoore

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Cookeville, TN

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There are several different forms of polymer concrete. It's like an epoxy slurry. One of the compounds commercially available is called Moglice. Basically, you can look at polymer concrete like you would at granite. Granite is stiff and light compared to steel or cast iron. A similar volume of granite weighs about what aluminum would weigh.

Polymer concretes main attraction is that it can be formed into near net shapes by molding.

TM

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05-07-2005 05:00 PM  13 years agoPost 10
OT45

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Kingston, NY

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I have heared of moglice. I think it's also used for way repairs. Never thought the mass of granite is similar to alum. Boy, you learn something new everyday on RR Thanks for sharing.

totSandman, I would probably lean toward the Sherline. They have many options and tooling available. I suggest getting one of their catalogs. As long as you don't expect it to be a production machine and use it for what it was designed for you should be okay.

-OT

scratch building is not just for planks

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05-29-2005 10:07 PM  13 years agoPost 11
tauscnc

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Joliet IL

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I have a lot of info on the shelrine and other cnc on my site. Maybe it will help answer some questions.

http://www.cuttingedgecnc.com

taus

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05-30-2005 12:28 AM  13 years agoPost 12
PaulH-MA

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Boston, MA

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Sandman, definitely check out Taus' web site. He knows what he's talking about. He's also a regular in http://www.cnczone.com/.

Taus, I didn't know you were a member over here. You sure get around! I'm the same guy who gave you advice about the stacked dado blade on the Zone.

--Paul

TREX 450
Bergen Intrepid Gasser x2

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05-30-2005 12:53 AM  13 years agoPost 13
tauscnc

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Joliet IL

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Hey PaulH-MA,

Thanks! Yep, been a member since 2004. I mostly post only about machining now, just a bit about helis. Between helis and cnc and learing woodworking, I try to stay busy. Thanks for the kind words.

taus

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05-30-2005 01:04 AM  13 years agoPost 14
PaulH-MA

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Boston, MA

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Cool! I'm just starting to get into CNCing as yet another hobby. A friend of mine and I will be building a CNC router later this summer. He wants to cut plane parts, but doesn't have much of a computer background. That's where I come in.
Thanks for the kind words.
Welcome; well deserved.

--Paul

TREX 450
Bergen Intrepid Gasser x2

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06-03-2005 07:36 AM  13 years agoPost 15
vertolnut

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northern California

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do it yourself alternate
emachineshop.com is another way to go. Design the part using their autocad program you download for free and they build the parts for you.

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06-05-2005 04:32 PM  13 years agoPost 16
tauscnc

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Joliet IL

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http://runryder.com/t171832p1/

Looking at this I say stay far away! Over $240 dollars for a heli stand that has material worth about $10 bucks...and then to still send such a crapy product.

Do yourself a favor and get your own machines. Even if you make it like this yourself at least you can be proud of it

taus
http://www.cuttingedgecnc.com

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