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    Default Re: Student organization looking to build CNC milling machine for school donation

    Quote Originally Posted by peteeng View Post
    Found a machine close to what you want on the forum. Look for Linux_fan new machine build gantry mill. Peter its a moving gantry but just nail it down and move the table.
    Thanks for finding that for me! I'll be taking the time to read through all you've sent me!



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    Default Re: Student organization looking to build CNC milling machine for school donation

    Hi 308 - Happy to answer your questions and please continue your research. Many of your questions will be self answering if you develop an objective and scope for the machine. A machine needs a reason to exist as I've mentioned before. If it does not have a strong reason or utility then it will be forgotten. So a bullet point list of its objectives is needed. Ideally it has a specialist use as well, makes it even better for the Uni or someone You say you have 12 people plus in the team and they are doing internships. One of those companies will have something special to do or difficult to solve put the word out. You mentioned tool steel in the beginning, was this a just a wish? or was something in mind. Tool steel is a tough call for a beginner machine but let's not put up any barriers...Peter



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    Default Re: Student organization looking to build CNC milling machine for school donation

    Hi 308 - Just to discuss setting your machine. Use a wicking loctite like attached. This means you will not need to pull down the machine once aligned. The idea is not to "glue" the machine together but to take up the empty space between joints. The parts are machined and unless you scrape the surfaces (a skilled job) then lap them they will sit on the high spots and crush these over time resulting in a loose machine. By filling up the space this process is slowed or stopped. A wicking adhesive is run along the edges and capillary action draws it into the joint then sets. Cheers Peter

    Attached Files Attached Files


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    Default Re: Student organization looking to build CNC milling machine for school donation

    Quote Originally Posted by peteeng View Post
    Hi 308 - Happy to answer your questions and please continue your research. Many of your questions will be self answering if you develop an objective and scope for the machine. A machine needs a reason to exist as I've mentioned before. If it does not have a strong reason or utility then it will be forgotten. So a bullet point list of its objectives is needed. Ideally it has a specialist use as well, makes it even better for the Uni or someone You say you have 12 people plus in the team and they are doing internships. One of those companies will have something special to do or difficult to solve put the word out. You mentioned tool steel in the beginning, was this a just a wish? or was something in mind. Tool steel is a tough call for a beginner machine but let's not put up any barriers...Peter

    Hi 308 - Just to discuss setting your machine. Use a wicking loctite like attached. This means you will not need to pull down the machine once aligned. The idea is not to "glue" the machine together but to take up the empty space between joints. The parts are machined and unless you scrape the surfaces (a skilled job) then lap them they will sit on the high spots and crush these over time resulting in a loose machine. By filling up the space this process is slowed or stopped. A wicking adhesive is run along the edges and capillary action draws it into the joint then sets. Cheers Peter
    Tool steel was simply a goal as I know it is very difficult to achieve this with non professional machines. I will keep an eye out to see if I can find any ways to make this machine stand out and have special functions, rather than just being a working machine. Thanks for the advice on the wicking adhesive! do you think it would be beneficial to spray on of the connecting surfaces with a mold release so that the machine components can be disassembled for maintenance or moving if necessary?

    Thanks,
    Daedalus



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    Default Re: Student organization looking to build CNC milling machine for school donation

    Hi 308 - No release necessary. The parts will come apart when needed to. Release films may affect the curing of the adhesive. Only set the machine once it has bedded in and its joints are pulled down for the last time. Look up asperity. Cheers Peter S



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    Default Re: Student organization looking to build CNC milling machine for school donation

    Thanks for the info!



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    Default Re: Student organization looking to build CNC milling machine for school donation

    Hi 308 - Just another thought. Edge drilling and tapping holes can be a chore in this sort of machine & if you strip one it's a thread repair. Think about using nut pockets. As you will be profiling the parts you can easily machine a nut pocket. Then when you do the edge hole the jobs done. Figure out your spanner clearance or make a narrow spanner to minimise pocket size. Cheers Peter

    Attached Thumbnails Attached Thumbnails Student organization looking to build CNC milling machine for school donation-bolt-detail-1-jpg   Student organization looking to build CNC milling machine for school donation-bolt-detail-2-jpg  
    Last edited by peteeng; 06-23-2019 at 08:01 PM.


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    Default Re: Student organization looking to build CNC milling machine for school donation

    Interesting idea! do you know how that affects rigidity if at all?



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    Default Re: Student organization looking to build CNC milling machine for school donation

    The global stiffness will be the same. You have to do some analysis to figure it out exactly. Peter



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    Default Re: Student organization looking to build CNC milling machine for school donation

    Quote Originally Posted by peteeng View Post
    Hi 308 - Just another thought. Edge drilling and tapping holes can be a core in this sort of machine & if you strip one its a thread repair. Think about using nut pockets. As you will be profiling the parts you can easily machine a nut pocket. Then when you do the edge hole the jobs done. Figure out your spanner clearance or make a narrow spanner to minimise pocket size. Cheers Peter
    Or just make the pocket a sliding fit for the nut so that the pocket is the spanner.

    7xCNC.com - CNC info for the minilathe (7x10, 7x12, 7x14, 7x16)


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    Default Re: Student organization looking to build CNC milling machine for school donation

    Hi 308- Since I had the little bolt model I made for you I did a simulation on the connection. Simsolid shows one assembly slipping while the other does not. The solid side is at full pretension the slipping side is at 1/10th pretension. I suggest you talk to Altair and get a student copy of Simsolid. It's the best software for doing this sort of thing. Peter

    https://www.facebook.com/ScootCNC/vi...2627793608277/

    https://altairhyperworks.com/



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    Default Re: Student organization looking to build CNC milling machine for school donation

    Quote Originally Posted by pippin88 View Post
    Or just make the pocket a sliding fit for the nut so that the pocket is the spanner.
    exactly what I was thinking!

    - - - Updated - - -

    Quote Originally Posted by peteeng View Post
    Hi 308- Since I had the little bolt model I made for you I did a simulation on the connection. Simsolid shows one assembly slipping while the other does not. The solid side is at full pretension the slipping side is at 1/10th pretension. I suggest you talk to Altair and get a student copy of Simsolid. It's the best software for doing this sort of thing. Peter

    https://www.facebook.com/ScootCNC/vi...2627793608277/

    https://altairhyperworks.com/
    thank you for the suggestions! I will look into it



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Student organization looking to build CNC milling machine for school donation

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