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eric-wieser / 2.12-robot

Final project for MIT's 2.12 - Intro to Robotics
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Laser/waterjet parts #18

Open eric-wieser opened 8 years ago

eric-wieser commented 8 years ago

Including but not limited to:

eric-wieser commented 8 years ago

We need to get this done very soon, and get materials - the tech review is on friday, and without these parts, we have very little to show. I have no access to either of these machines, nor experience exporting parts to cut from solidworks.

@reaganm : Have you found the material you want the sifter to be made of? Do you know where to get it? Is it worth laser-cutting, or will a bandsaw suffice?

@premphy : do you have a final arm design yet to evaluate the amount of material needed for?

cssubedi commented 8 years ago

Hey Guys,

I am almost done with the arm. I will commit it as soon as I am done. The aluminium sheet for the arm has arrived and is in the lab. So, I guess whoever has access to waterjets can pick up the sheet from lab and fabricate the part today. For the arm, we will also be needing a bending machine. I do not have access to any machine shop.

Thanks.

Chandan Sharma Subedi Department of Mechanical Engineering Massachusetts Institute of Technology premphy@mit.edu | 617-608-8694

From: Eric Wieser [notifications@github.com] Sent: Tuesday, November 10, 2015 12:29 PM To: eric-wieser/2.12-robot Cc: Chandan Sharma Subedi Subject: Re: [2.12-robot] Laser/waterjet parts (#18)

We need to get this done very soon, and get materials - the tech review is on friday, and without these parts, we have very little to show. I have no access to either of these machines, nor experience exporting parts to cut from solidworks.

@reaganmhttps://github.com/reaganm : Have you found the material you want the sifter to be made of? Do you know where to get it? Is it worth laser-cutting, or will a bandsaw suffice?

@premphyhttps://github.com/premphy : do you have a final arm design yet to evaluate the amount of material needed for?

— Reply to this email directly or view it on GitHubhttps://github.com/eric-wieser/2.12-robot/issues/18#issuecomment-155499741.

reaganm commented 8 years ago

Today I acquired some free 1/4" acrylic sheets and will be able to laser cut the sifter later tonight after updating the CAD. Should I be cutting anything else other than the sifter?

eric-wieser commented 8 years ago

Nicely done!

Will you be able to cut the arm too? Ideally, we'd get all the pulley mounts on the sheet metal as well. What should I be doing in solidworks to lay these out on a sheet that you can then lasercut?

On Thu, Nov 12, 2015 at 6:33 PM, reaganm notifications@github.com wrote:

Today I acquired some free 1/4" acrylic sheets and will be able to laser cut the sifter later tonight after updating the CAD. Should I be cutting anything else other than the sifter?

— Reply to this email directly or view it on GitHub https://github.com/eric-wieser/2.12-robot/issues/18#issuecomment-156270856 .

reaganm commented 8 years ago

The size of the laser cutter I have access to is 12" x 16", so if you can fit the arm parts on sheets of that size then yes. I may be able to access the larger laser cutter in csail, but its not a guarantee I'd be able to do that tonight. On a side note, I was able to find some 1/2" acrylic as well, but its not as easily accessible to me tonight, if that is useful for us at all. On Nov 12, 2015 6:37 PM, "Eric Wieser" notifications@github.com wrote:

Nicely done!

Will you be able to cut the arm too? Ideally, we'd get all the pulley mounts on the sheet metal as well. What should I be doing in solidworks to lay these out on a sheet that you can then lasercut?

On Thu, Nov 12, 2015 at 6:33 PM, reaganm notifications@github.com wrote:

Today I acquired some free 1/4" acrylic sheets and will be able to laser cut the sifter later tonight after updating the CAD. Should I be cutting anything else other than the sifter?

— Reply to this email directly or view it on GitHub < https://github.com/eric-wieser/2.12-robot/issues/18#issuecomment-156270856

.

— Reply to this email directly or view it on GitHub https://github.com/eric-wieser/2.12-robot/issues/18#issuecomment-156271530 .

eric-wieser commented 8 years ago

We should be able to cut the sheet in half, and put some of the arm on one half, and the rest + pulley mounts on the other

reaganm commented 8 years ago

Cool, if you can lay everything out in N 12"x16" dxf files where N < 3 and send them to me before midnight I can cut them. Try conserve things to 10"x16" wherever possible because some of the acrylic sheets were cut poorly. On Nov 12, 2015 6:55 PM, "Eric Wieser" notifications@github.com wrote:

We should be able to cut the sheet in half, and put some of the arm on one half, and the rest + pulley mounts on the other

— Reply to this email directly or view it on GitHub https://github.com/eric-wieser/2.12-robot/issues/18#issuecomment-156274479 .

eric-wieser commented 8 years ago

@14kirchm and I are working on laying those out now

cssubedi commented 8 years ago

Do you also have access to waterjet? We will also have to fabricate arm on 1/8 inch aluminium sheet.

Chandan Sharma Subedi Department of Mechanical Engineering Massachusetts Institute of Technology premphy@mit.edu | 617-608-8694

From: reaganm [notifications@github.com] Sent: Thursday, November 12, 2015 8:01 PM To: eric-wieser/2.12-robot Cc: Chandan Sharma Subedi Subject: Re: [2.12-robot] Laser/waterjet parts (#18)

Cool, if you can lay everything out in N 12"x16" dxf files where N < 3 and send them to me before midnight I can cut them. Try conserve things to 10"x16" wherever possible because some of the acrylic sheets were cut poorly. On Nov 12, 2015 6:55 PM, "Eric Wieser" notifications@github.com wrote:

We should be able to cut the sheet in half, and put some of the arm on one half, and the rest + pulley mounts on the other

— Reply to this email directly or view it on GitHub https://github.com/eric-wieser/2.12-robot/issues/18#issuecomment-156274479 .

— Reply to this email directly or view it on GitHubhttps://github.com/eric-wieser/2.12-robot/issues/18#issuecomment-156285589.

mkirchmeyer commented 8 years ago

No we don't but the plan is to have Maggie laser cut the pieces. We are laying the parts in dxf

eric-wieser commented 8 years ago

@premphy, to confirm, you do not need to lay out the arm - we're working on that.

eric-wieser commented 8 years ago

Final call on #16? Do we change the rail motor mounts to hold the MX64s?

eric-wieser commented 8 years ago

@reaganm, do you have the ability to cut the sheet we have into pieces? Is the sheet still in the lab, @premphy?

cssubedi commented 8 years ago

sheet is in the lab, I don't have access to machine shop. So, I can't cut them.

Chandan Sharma Subedi Department of Mechanical Engineering Massachusetts Institute of Technology premphy@mit.edu | 617-608-8694

From: Eric Wieser [notifications@github.com] Sent: Thursday, November 12, 2015 8:36 PM To: eric-wieser/2.12-robot Cc: Chandan Sharma Subedi Subject: Re: [2.12-robot] Laser/waterjet parts (#18)

@reaganmhttps://github.com/reaganm, do you have the ability to cut the sheet we have into pieces? Is the sheet still in the lab, @premphyhttps://github.com/premphy?

— Reply to this email directly or view it on GitHubhttps://github.com/eric-wieser/2.12-robot/issues/18#issuecomment-156290283.

eric-wieser commented 8 years ago

I have access to a bandsaw here, but I'm a bit nervous I've got the wrong blade on it

reaganm commented 8 years ago

I don't have access to a bandsaw/waterjet after business hours unfortunately. If we need more acrylic than 3 sheets of 12x16 for the arm I can get more tomorrow. On Nov 12, 2015 8:36 PM, "Eric Wieser" notifications@github.com wrote:

@reaganm https://github.com/reaganm, do you have the ability to cut the sheet we have into pieces? Is the sheet still in the lab, @premphy https://github.com/premphy?

— Reply to this email directly or view it on GitHub https://github.com/eric-wieser/2.12-robot/issues/18#issuecomment-156290283 .

eric-wieser commented 8 years ago

All this acrylic is 1/4 in, right? Sadly the M5 bolts I bought for the pulley mounts assume 1/8in...

And unless you have a good way to fold acrylic, the arm is going to need to be metal.

@reaganm, Can you confirm if the laser cutter is able to cut aluminum?

reaganm commented 8 years ago

Laser cutter does not cut aluminum. I can grab appropriate sized bolts tomorrow morning from csail. On Nov 12, 2015 9:24 PM, "Eric Wieser" notifications@github.com wrote:

All this acrylic is 1/4 in, right? Sadly the M5 bolts I bought for the pulley mounts assume 1/8in...

And unless you have a good way to fold acrylic, the arm is going to need to be metal.

@reaganm https://github.com/reaganm, Can you confirm if the laser cutter is able to cut aluminum?

— Reply to this email directly or view it on GitHub https://github.com/eric-wieser/2.12-robot/issues/18#issuecomment-156301233 .

eric-wieser commented 8 years ago

In that case, we may as well cut the brackets out of acrylic tonight, and hope we can find the bolts later. I can send you a DXF in the next 15 minutes

eric-wieser commented 8 years ago

@reaganm It's in the repository here

eric-wieser commented 8 years ago

Just realized that dxf doesn't account for the "kerf" of the laser. Oops. Not sure how I'm supposed to add that anyway though...

cssubedi commented 8 years ago

I think when you laser cut, you can specify the cutting kerf offset...Not sure though

reaganm commented 8 years ago

I was going to go to lab at 11 tomorrow and get the sheet so I can hopefully waterjet before 2. Is there a final layout that will fit on the sheet we have?

eric-wieser commented 8 years ago

@premphy, where are we with the arm?

simpri21 commented 8 years ago

Does anyone know where the sheet metal is? I can water jet the arm parts right now On Nov 29, 2015 5:21 PM, "Eric Wieser" notifications@github.com wrote:

@premphy https://github.com/premphy, where are we with the arm?

— Reply to this email directly or view it on GitHub https://github.com/eric-wieser/2.12-robot/issues/18#issuecomment-160476157 .

eric-wieser commented 8 years ago

It's on the upper part of the desk in the lab.

The cad is not suitable for cutting right now (#53)

simpri21 commented 8 years ago

Oh okay On Nov 30, 2015 6:49 PM, "Eric Wieser" notifications@github.com wrote:

It's on the upper part of the desk in the lab.

The cad is not suitable for cutting right now...

On Mon, Nov 30, 2015 at 6:29 PM, simpri21 notifications@github.com wrote:

Does anyone know where the sheet metal is? I can water jet the arm parts right now On Nov 29, 2015 5:21 PM, "Eric Wieser" notifications@github.com wrote:

@premphy https://github.com/premphy, where are we with the arm?

— Reply to this email directly or view it on GitHub <

https://github.com/eric-wieser/2.12-robot/issues/18#issuecomment-160476157

.

— Reply to this email directly or view it on GitHub < https://github.com/eric-wieser/2.12-robot/issues/18#issuecomment-160797159

.

— Reply to this email directly or view it on GitHub https://github.com/eric-wieser/2.12-robot/issues/18#issuecomment-160801182 .

eric-wieser commented 8 years ago

According to @premphy

I acquired some aluminum sheet from friend that can be bent. We will use those to make servo mounts. I will drop them onto our box today during lab.

So maybe those could be cut. I'm not sure if we have a lasercutter file for that though

eric-wieser commented 8 years ago

the full list of unresolved arm problems

reaganm commented 8 years ago

@simpri21 are you going to be able to waterjet the arm parts today? @premphy says all the cad is done and in the Hand_new folder. I can lay out all the parts in .dxf if that makes it easier. If you can't then we should start making other plans now.

eric-wieser commented 8 years ago

I've just corrected the \hardware\Parts\Hand\Hand_new\Sheet3_mounts.SLDDRW file to show the parts unfolded

eric-wieser commented 8 years ago

@premphy, can you confirm that \hardware\Parts\Sheet3_mounts.SLDDRW is the outdated version? (and if so, delete it, to prevent accidentally cutting it`

In general, it's a bad idea to leave anything old lying around

cssubedi commented 8 years ago

I could not find anything like that in \hardware\Parts\ directory..everything associated with arm is under \hardware\parts\hand\hand_new directory. I guess someone already deleted it.

cssubedi commented 8 years ago

I have taken vs-11 servo to test the position control from Arduino. Will be back at 4pm.

Chandan Sharma Subedi Department of Mechanical Engineering Massachusetts Institute of Technology premphy@mit.edu | 617-608-8694

From: Eric Wieser [notifications@github.com] Sent: Wednesday, December 02, 2015 11:57 AM To: eric-wieser/2.12-robot Cc: Chandan Sharma Subedi Subject: Re: [2.12-robot] Laser/waterjet parts (#18)

@premphyhttps://github.com/premphy, can you confirm that \hardware\Parts\Sheet3_mounts.SLDDRW is the outdated version? (and if so, delete it, to prevent accidentally cutting it`

— Reply to this email directly or view it on GitHubhttps://github.com/eric-wieser/2.12-robot/issues/18#issuecomment-161363745.