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[slappynuts]

I am working on a lathe/mill bed design that takes the bulk of the machine and makes it out of things that are readily available to menards/home depot. I am going to try to design a useful machine that anyone can build anywhere and it can be as big as we want it or as small as we want. I think we can get some of the people on the forum here that have things like laser cutters and cnc machines involved for parts that cannot be made with simple tools. They can also give advice for the project.

Im thinking a cross between this.

http://xa.yimg.com/kq/groups/13335163/1942903983/name/MM++lathe+How+to+Build21a.pdf

And the gingery lathe.

[92CXyD]

I like this idea, 

[slappynuts]

I like this idea, 

Good then you can help me. Draw up some half block cement blocks in google sketchup. We are going to be bolting these together with 1/4" steel plates in between with threaded rod. This is the plan. Rigid and lots of mass. I think we can get MBS to cut us the parts and just about anyone will be able to bolt one together.

[92CXyD]

I like this idea, 

Good then you can help me. Draw up some half block cement blocks in google sketchup. We are going to be bolting these together with 1/4" steel plates in between with threaded rod. This is the plan. Rigid and lots of mass. I think we can get MBS to cut us the parts and just about anyone will be able to bolt one together.

alright I'll have to get use google sketch again, been a while. I rather sketch it up on some Engineering Comp paper. 

[slappynuts]

I am trying to keep it in a format that people can all download and use freely. There is even a patch for sketchup to convert files to DXF so that it can be easily cut by CNC machines.

[92CXyD]

Kool 

[92CXyD]

Cool idea. I have never used Google sketchup but I have pro-e, solidworks, AutoCAD, master cams, etc if you some drawings done.

Do ya have any bootleg copys I can get from ya? 

[slappynuts]

Cool idea. I have never used Google sketchup but I have pro-e, solidworks, AutoCAD, master cams, etc if you some drawings done.

Google sketchup is free and if you can use production cad you can step right in and use sketchup. We need to keep this so everyone can contribute. Here is a great tutorial.

http://sketchup.google.com/training/videos/new_to_gsu.html

link to software.

http://sketchup.google.com/download/gsu.html

[Passenger]

While I enjoy building equipment, this is going to end with lackluster results. The amount of work that goes into something like this to effectively cut metals will far exceed the cost of buying a good used machine. Now if you are trying to cut plastic or wood with very loose tolerances and no need for a good surface finish you will likely be much more satisfied.

[slappynuts]

While I enjoy building equipment, this is going to end with lackluster results. The amount of work that goes into something like this to effectively cut metals will far exceed the cost of buying a good used machine. Now if you are trying to cut plastic or wood with very loose tolerances and no need for a good surface finish you will likely be much more satisfied.

People get decent tolerances out of the gingery lathe, its all about who sets the machine up. What we are working on will be much more rigid and larger than the gingery is. We have a couple of grizzly machines in the shop I work at and those are what I am shooting for as far as tolerances go. I think to keep it simple for now im going to use a grizly X/Y table.

These are $132

[slappynuts]

First part is drawn (took about 5 min  ). I will look for a place that hosts files so anyone can get the parts and start contributing at anytime.

[slappynuts]

Here you guys go. Anyone with google SKP should be able to open this file and add whatever they like to it.

http://www.filedropper.com/halfblock

[Passenger]

While I enjoy building equipment, this is going to end with lackluster results. The amount of work that goes into something like this to effectively cut metals will far exceed the cost of buying a good used machine. Now if you are trying to cut plastic or wood with very loose tolerances and no need for a good surface finish you will likely be much more satisfied.

People get decent tolerances out of the gingery lathe, its all about who sets the machine up. What we are working on will be much more rigid and larger than the gingery is. We have a couple of grizzly machines in the shop I work at and those are what I am shooting for as far as tolerances go. I think to keep it simple for now im going to use a grizly X/Y table.

These are $132

Mass only goes so far for rigidity, the fit of the parts is going to be pinacle here. Are you good at scraping? What are you using for a spindle?

[slappynuts]

 I think compressed concrete blocks with steel bar stock between them is going to be very rigid. Im looking at ways to test rigidity right now.

[Passenger]

I think compressed concrete blocks with steel bar stock between them is going to be very rigid. Im looking at ways to test rigidity right now.

It will resonate a lot, which is not good for machining. Aside from that, how are you going to deal with all of your precision mounting surfaces? I honestly think you would be a lot better off just building a steel weldement for a base, if you want to get fancy you could fill the cavities with a high shore urethane.

[slappynuts]

I think compressed concrete blocks with steel bar stock between them is going to be very rigid. Im looking at ways to test rigidity right now.

It will resonate a lot, which is not good for machining. Aside from that, how are you going to deal with all of your precision mounting surfaces? I honestly think you would be a lot better off just building a steel weldement for a base, if you want to get fancy you could fill the cavities with a high shore urethane.

I thought about that as well. Everything is a trade off, cost vs accuracy. One of the ideas I also has was core filling the block.

[Passenger]

I think compressed concrete blocks with steel bar stock between them is going to be very rigid. Im looking at ways to test rigidity right now.

It will resonate a lot, which is not good for machining. Aside from that, how are you going to deal with all of your precision mounting surfaces? I honestly think you would be a lot better off just building a steel weldement for a base, if you want to get fancy you could fill the cavities with a high shore urethane.

I thought about that as well. Everything is a trade off, cost vs accuracy. One of the ideas I also has was core filling the block.

Which brings me back to my first comment of just buying the machine used, better quality, less cost, less time.

[slappynuts]

We will see when I get to testing it I guess.

[slappynuts]

My other thought was using engine blocks or cyl heads as the backbone of the machine. I think that would work well but it would be harder to come up with standard parts that everyone could use.

[slappynuts]

I am leaning toward round ways.

[slappynuts]

I think bar stock ways with babbit bearings would be a very effective Nog procedure.

[rawr]

I think compressed concrete blocks with steel bar stock between them is going to be very rigid. Im looking at ways to test rigidity right now.

Buy an old surface plate for a base.  People sell them used all the time for entirely too cheap when they get pitted and worn. Plus you can resurface them with sandpaper and a flat bar

[rawr]

As much as i hate to I kind of agree with dave here. I've seen used mills for less than the cost of what the steel to make them would be.

[crxvtec91]

I say go for it, do it the rhmt way cheap and good!

[glustic]

Good thing buk hasnt chimed in here

[Passenger]

Round ways = tres balls. No adjustment...

Engine blocks for a base, is much better then concrete, particularily if you filled the bores and water passages.

[slappynuts]

Round ways if set up the right way are adjustable in every direction. My only concern with them would be rigidity but it will have support every 8" from between the blocks.

[slappynuts]

I havr two laptops with full battery ~9 hours and a 17hr plane trip coming up. then an overnight layover in Manila to work on my design. I should have something for you guys by the end of the week.

[bigdaddyvtec]

Hopefully you can find some time to fuck yourself int there as well... It may provide a bit of relief from all the twigpussy cock you sat on over there in Ladyboiheaven.








FUCK YOU 

[Passenger]

Round ways if set up the right way are adjustable in every direction. My only concern with them would be rigidity but it will have support every 8" from between the blocks.

No, not really, that is precisely why they are not used for machine tools.