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  1. #1
    Rather than continue to hijack Joe's build thread I thought it best to post a separate question.

    DC posted a link for a build where the guy had used an epoxy adhesive to build a steel frame rather than by welding. Having just read some of the latest posts an L shaped gantry seems to be favored by a few people & I wondered if building an L shaped gantry using aluminium box section rather than the extruded profile section would work if constructed this way.

  2. #2
    D.C.'s Avatar
    Lives in Birmingham, United Kingdom. Last Activity: 05-01-2016 Has been a member for 4-5 years. Has a total post count of 326. Received thanks 30 times, giving thanks to others 24 times.
    I was wondering this myself, I think box section looks to be a better choice than extrusion because it's cheaper and you always have the option of pouring concrete in to improve stiffness at a later date.

    I'm still a little cautious about using ally in place of steel though because it is inherently a less rigid material, if you need to triple the amount of material to get the same stiffness as steel, the cost/weight benefit has just disappeared.

  3. #3
    Problem with steel though DC is that people have said it is not flat enough for rails to be mounted on so you are then looking at some way to get it flat for the rails, if you don't have access to grinding/machining equipment how do you get it flat enough without having it machined by someone else which is another expense.

  4. #4
    D.C.'s Avatar
    Lives in Birmingham, United Kingdom. Last Activity: 05-01-2016 Has been a member for 4-5 years. Has a total post count of 326. Received thanks 30 times, giving thanks to others 24 times.
    self leveling epoxy. :)

    Got to get this unhealthy obsession with epoxy in somewhere!

  5. #5
    If you are using supported rails then steel is flat enough.

  6. #6
    D.C.'s Avatar
    Lives in Birmingham, United Kingdom. Last Activity: 05-01-2016 Has been a member for 4-5 years. Has a total post count of 326. Received thanks 30 times, giving thanks to others 24 times.
    I was looking at using west system 209 super slow low viscoscity epoxy (much cheaper than the specialist stuff) and stumbled across this thread on cnczone:

    New Machine Build 5.5' x 10' steel router - CNCzone.com-The Largest Machinist Community on the net!

  7. #7
    Quote Originally Posted by D.C. View Post
    I was looking at using west system 209 super slow low viscoscity epoxy (much cheaper than the specialist stuff) and stumbled across this thread on cnczone:

    New Machine Build 5.5' x 10' steel router - CNCzone.com-The Largest Machinist Community on the net!

    Interesting stuff that! Please don't get me started on another obsession.... the whole CNC thing is already difficult enough to handle without all other aspects of my life falling to pieces! Lol

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  9. #8
    I could probably just use 205 if I went down that road DC, it's that cold in the unit just now that the working life is extended considerably by the temperature lol. Probably already got enough resin so would just need to buy the 209. How would you intend setting it up perfectly level though? Guy doesn't go into a lot of detail about how he set things up before he poured the resin.

  10. #9
    D.C.'s Avatar
    Lives in Birmingham, United Kingdom. Last Activity: 05-01-2016 Has been a member for 4-5 years. Has a total post count of 326. Received thanks 30 times, giving thanks to others 24 times.
    It doesn't have to be 'perfectly' level before you pour the resin, gravity gives you a flat surface on the top of the resin to mount rails on after the resin has set.

    The cost of the resin works out as less than the cost of buying a decently accurate spirit level...

  11. #10
    Quote Originally Posted by D.C. View Post
    It doesn't have to be 'perfectly' level before you pour the resin, gravity gives you a flat surface on the top of the resin to mount rails on after the resin has set.

    The cost of the resin works out as less than the cost of buying a decently accurate spirit level...
    Yer, obviously wasn't thinking when I posted lol Must be an old age thing. I was thinking you could end up with a quite thick bed of resin at one end lol but it would be easy enough to get it close to level with a spirit level. Not short of spirit levels or laser levels so got that covered, got enough resin so really just need the hardener.
    Is it just resin & hardener that you have read about DC or are people adding a filler powder or something else to help

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