1. #1
    I've had these designs for a while now to make some mountain board trucks. I have no experience with CNC or working with metals but I'd love to get a few made, so I'm looking for someone I can hand over the plans to and make them. Unfortunately the designs are on sketchup :( as I can no longer access Solidworks. The axle is 250 x 24 x 24 mm, and the hanger is 100 x 40 x 14 mm. These dimensions can be changed a bit to reduce work/cost. I'm guessing it's best to make them out of aluminium, not sure if a very high grade is required as they're pretty beefy. Basically I have no idea what I need to do, but I know what I want to end up with. If you think you can make them, great, if not, could you tell me why?

    Now for some pretty pictures to give you an idea, comes in two parts, the axle and hanger. As you can see they are bolted together, the axle is also threaded to accommodate an axle bolt. I'll be much more specific if it can be done. A rough cost per unit would be handy to know too.

    Click image for larger version. 

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  2. #2
    Quote Originally Posted by Brennig View Post
    I've had these designs for a while now to make some mountain board trucks. I have no experience with CNC or working with metals but I'd love to get a few made, so I'm looking for someone I can hand over the plans to and make them. Unfortunately the designs are on sketchup :( as I can no longer access Solidworks. The axle is 250 x 24 x 24 mm, and the hanger is 100 x 40 x 14 mm. These dimensions can be changed a bit to reduce work/cost. I'm guessing it's best to make them out of aluminium, not sure if a very high grade is required as they're pretty beefy. Basically I have no idea what I need to do, but I know what I want to end up with. If you think you can make them, great, if not, could you tell me why?

    Now for some pretty pictures to give you an idea, comes in two parts, the axle and hanger. As you can see they are bolted together, the axle is also threaded to accommodate an axle bolt. I'll be much more specific if it can be done. A rough cost per unit would be handy to know too.

    Click image for larger version. 

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    Hi There and welcome to the forum, I am not able to make these because im not clever enough but if i can i would like to ask a few questions.

    Firstly i assume the The axle stubs for the wheels would be made from steel..?

    If that is the case would they need to be removable or fixed..?

    This type of thing is usually cast then machined, is that what you are looking for, or just machined billet..?

    Do you have any pictures of other commercially available ones..?

    I only ask because a clear understanding of what is required will maximise your chances of getting someone to help you out with your project

    Rick
    Always bear in mind that your own resolution to succeed is more important than any other - Abe Lincoln

  3. #3
    By axle stubs do you mean the bolts in the first picture? They're just steel M12 bolts that thread into the axle so they are removable. I am assuming billet will be a lot better for very low quantities. Depending on price I would make 2 sets, so four of each part, and if they're good I'll make 10ish.

    They're kind of like these (you can see that it's two parts welded together).

    Click image for larger version. 

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  4. #4
    oscar's Avatar
    Lives in Oxford, United Kingdom. Last Activity: 3 Hours Ago Has been a member for 5-6 years. Has a total post count of 57. Received thanks 2 times, giving thanks to others 1 times.
    For the initial two sets I would get some 25mm square bar for the axles and some 14mm plate. Then take it to a local blacksmith and get him to drill and tap the M12 holes. Then heat and bend the bar to shape. Bending has the benefit of being stronger because you are keeping the grain of the metal intact, rather than cutting through it on a mill. Also you aren't wasting material/money by machining a bigger bit of material down to size and shape.
    Then if your happy with how these parts perform they can either make you a batch the same way, or make you a form to go in a press. Whichever is the cheapest option.
    I wouldn't personally go down the CNC route on the axle. Only on the plate part when you want a batch of them.
    Hope this helps.

  5. #5
    Quote Originally Posted by oscar View Post
    For the initial two sets I would get some 25mm square bar for the axles and some 14mm plate. Then take it to a local blacksmith and get him to drill and tap the M12 holes. Then heat and bend the bar to shape. Bending has the benefit of being stronger because you are keeping the grain of the metal intact, rather than cutting through it on a mill. Also you aren't wasting material/money by machining a bigger bit of material down to size and shape.
    Then if your happy with how these parts perform they can either make you a batch the same way, or make you a form to go in a press. Whichever is the cheapest option.
    I wouldn't personally go down the CNC route on the axle. Only on the plate part when you want a batch of them.
    Hope this helps.
    Yes, it is a pretty simple design and I had wondered if it was possible to do it manually. It'll just take someone with the right tools, I don't think I know anyone capable of doing it but it won't curt to ask around. If I did print off plans and source some metal, would I expect a blacksmith to get on with the job? Basically the job could be done by:

    Axle
    Bending the axle
    Drill 2 6 mm holes
    Drill 2 12mm holes and tap it

    Hanger

    Cut the outside shape
    Drill 25mm (i think) holes part way through
    Drill 12 mm holes
    Drill 2 6 mm holes
    Drill the cone shape thing, it's like a big countersink hole.

    Thanks

  6. Milling the plates would not be a problem. Though for 12 mm bolts you want a bit greater then a 12 mm hole as a pass through. Also if you want to use ali' for the axle bar forging without special equipment (read very expensive last I checked) will not turn out well. Aluminium tends to work better if either cast to shape, cast and milled, or milled. Forging of ali' as done when making ali' profile requires a very good amount of heat and pressure to get a good result (reason the stuff costs so much).

    Michael

  7. #7
    Quote Originally Posted by Dom View Post
    Morning Brennig. If these are for a prototype id be happy to have a go at milling a set for you from aluminium billet, if you are happy with the result we can then run more sets off. If you email me some sketch's with bolt hole spacing and dimensions ill solid model it and we can go from there if you wish to continue.

    Regards Dom
    Im hoping you will post some pics when you do them as they would be great to see.

    Rick
    Always bear in mind that your own resolution to succeed is more important than any other - Abe Lincoln

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