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Author Topic: We need a group design project.  (Read 26600 times)

slappynuts

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Re: We need a group design project.
« Reply #30 on: January 16, 2012, 03:08:32 PM »
That is exactly what they have in that first link I posted.
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Passenger

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Re: We need a group design project.
« Reply #31 on: January 16, 2012, 07:13:16 PM »
I see that, but they are junk. Simple box, or dovetail will work much better because you can actually have some gib adjustment.
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slappynuts

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Re: We need a group design project.
« Reply #32 on: January 16, 2012, 07:54:01 PM »
I plan on running them on the side and making them adjustable.
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Passenger

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Re: We need a group design project.
« Reply #33 on: January 16, 2012, 08:38:20 PM »
Quote from: slappynuts on January 16, 2012, 07:54:01 PM
I plan on running them on the side and making them adjustable.

So that you have two tiny assed contact points on your cylinder leaving the rest to rattle around? Seriously, think about it, box ways have huge surface contact area and can be adjusted for pressure by two gibs only. Even if you had 4 gibs on a cylinder you wouldn't have 1/16 the amount of contact of a square gib of the SAME surface area.
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weirtech

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Re: We need a group design project.
« Reply #34 on: January 17, 2012, 09:36:26 AM »
i'd go with box way or dovetail for sure.  far more rigid imo.

have you thought about casting the base out of metal?
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mandrel-bends

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Re: We need a group design project.
« Reply #35 on: January 17, 2012, 03:31:50 PM »
You know you can buy old mills off craigslist for ~500-1000 bucks if you're patient. This is going to get expensive and time consuming fast. 
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Columbia River Mandrel Bending
CNC Mandrel Bending &ampamp Precision Waterjet Cutting
http://www.mandrelbends.com

dvst8r

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Re: We need a group design project.
« Reply #36 on: January 17, 2012, 06:20:27 PM »
Quote from: mandrel-bends on January 17, 2012, 03:31:50 PM
...This is going to get expensive and time consuming fast.

He is in employee getting paid by the hour, he has all the time in the world.
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There are two kinds of people: Sheep and sharks. Sharks are winners and they don'#039#039t look back '#039#039cause they don'#039#039t have necks. Necks are for sheep.

Passenger

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Re: We need a group design project.
« Reply #37 on: January 17, 2012, 10:04:37 PM »
Quote from: dvst8r on January 17, 2012, 06:20:27 PM
Quote from: mandrel-bends on January 17, 2012, 03:31:50 PM
...This is going to get expensive and time consuming fast.

He is in employee getting paid by the hour, he has all the time in the world.

Whaaaatttt, you mean being self employed doesn't mean having unlimited time and money?
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dvst8r

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Re: We need a group design project.
« Reply #38 on: January 17, 2012, 10:35:16 PM »
Quote from: Passenger on January 17, 2012, 10:04:37 PM
Quote from: dvst8r on January 17, 2012, 06:20:27 PM
Quote from: mandrel-bends on January 17, 2012, 03:31:50 PM
...This is going to get expensive and time consuming fast.

He is in employee getting paid by the hour, he has all the time in the world.

Whaaaatttt, you mean being self employed doesn't mean having unlimited time and money?

Well in your case unlimited money fits  :P, but you do seem to be short on time typically...  :D
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There are two kinds of people: Sheep and sharks. Sharks are winners and they don'#039#039t look back '#039#039cause they don'#039#039t have necks. Necks are for sheep.

DSharp

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Re: We need a group design project.
« Reply #39 on: January 17, 2012, 11:40:49 PM »
sounds like a 4 axis mill, no?  I'm currently designing/building a cnc router. for cheep ball screws and linear bearings check out ebay. I just bought 3 ball screws and linear rail sets 500mm 1000mm and 1500mm travel for around 500 from linearmotionbearing2008.  ball screws are precision grade c7 so you'll get .002" lead accuracy per foot and the backlash is typically around .0005".

You need to be concerned with the rigidity of your machine.  from what Ive found you want the following minimum for milling:
50,000 lbs/in deflection for steel
12,000 lbs/in defection  for Al
2,000 lbs/in for wood

this is between the cutting tool and the work piece.
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No escape from the mass mind rape

Passenger

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Re: We need a group design project.
« Reply #40 on: January 18, 2012, 04:06:54 PM »
Quote from: dvst8r on January 17, 2012, 10:35:16 PM
Quote from: Passenger on January 17, 2012, 10:04:37 PM
Quote from: dvst8r on January 17, 2012, 06:20:27 PM
Quote from: mandrel-bends on January 17, 2012, 03:31:50 PM
...This is going to get expensive and time consuming fast.

He is in employee getting paid by the hour, he has all the time in the world.

Whaaaatttt, you mean being self employed doesn't mean having unlimited time and money?

Well in your case unlimited money fits  :P, but you do seem to be short on time typically...  :D

I wouldn't be comfortable having one without the other. Unfortunately I have neither.
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slappynuts

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Re: We need a group design project.
« Reply #41 on: January 18, 2012, 04:14:34 PM »
It has been done before with the round ways. I think this is the simplest way to build this machine on the cheap. This also has the advantage of being able to be assembled in places you could never get a existing machine.
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Passenger

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Re: We need a group design project.
« Reply #42 on: January 18, 2012, 04:25:29 PM »
Quote from: slappynuts on January 18, 2012, 04:14:34 PM
It has been done before with the round ways. I think this is the simplest way to build this machine on the cheap. This also has the advantage of being able to be assembled in places you could never get a existing machine.

Right, it was done and abandoned, for a reason. You realize you can buy used machine tools even in third world shitholes right? It seems like you are trying to create a solution for which there is no problem.
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slappynuts

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Re: We need a group design project.
« Reply #43 on: January 19, 2012, 05:30:53 PM »
So who else wants to help design this? I am open to whatever type of ways we decide on as a group.
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rawr

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Re: We need a group design project.
« Reply #44 on: January 19, 2012, 05:51:54 PM »
come up with a cooler idea for something to design and i'll help you
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slappynuts

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Re: We need a group design project.
« Reply #45 on: January 19, 2012, 05:56:34 PM »
Quote from: rawr on January 19, 2012, 05:51:54 PM
come up with a cooler idea for something to design and i'll help you

This is a cool design. Oh well, fuck it I will just buy one.
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rawr

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Re: We need a group design project.
« Reply #46 on: January 19, 2012, 06:02:13 PM »
it would be cool to make out of something in your garage but it's not going to be out of material thats easy enough to aquire to make it universal. Like if you have a hook up on engine blocks or something, know what I mean, dog?
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slappynuts

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Re: We need a group design project.
« Reply #47 on: January 19, 2012, 06:19:05 PM »
Quote from: rawr on January 19, 2012, 06:02:13 PM
it would be cool to make out of something in your garage but it's not going to be out of material thats easy enough to aquire to make it universal. Like if you have a hook up on engine blocks or something, know what I mean, dog?

The stuff im designing with are probably the most readily available stuff you can get.
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