mag body, Ti spindle, no carbon, ceramic bearings, concave, replacable pins
and when can i get a set in red and for how much?
and when can i get a set in red and for how much?
How many of you would rock these pedals
- Thread starter SquadraCorse
- Start date
I'll go for polished...
Some questions for you and suggestions.
Questions
1) Concavity?
2) Material?
3) Have you carried out any FEA regarding the spindle or done the mathematics to spec out bearings based on whatever design you are running, this shouldn't be terribly difficult if you're an engineer?
Suggestions
The design isn't optimized for manufacturing let alone for something that is done as a possible one off. If there is any casting, the tooling cost will be very expensive. Even if you were to use something like DPT-Fast metal casting using plaster tooling the cost will still be high and I'm not even sure if they would offer cast aluminum or magnesium you would need to use. You also would likely need to redesign the pin webbing if the parts were cast. Take into account that you would need to perform final machining with multiple fixturing or use a mahine with 4-axis along with finishing and you have quite the operation for something that you want to make a few of.
If you are planning to mahine these you may want to increase the radius of the large inside pockets. Just looking at them they appear pretty small, so small that you would need to machine the pockets first with a larger tool and then finish mahine with a smaller tool that could break based on that pocket depth. It would increase machining time significantly = more expensive part. If you increase the radius between 1/8" to 1/4" you could do that pocket with only one tool and it would drop the maching time a bunch. Also, you would have to set-up the aluminum block in a vice or fixture twice to do 2 side-ops which although they are simple, is more machining time and if you aren't doing the maching yourself it means more $$$. Lastly, although the small fillet radius softens the part nicely for I.D. purposes, were you planning on machining it? You wouldn't be able to machine any of the radii except the ones that you are coming straight down at while machining, so effectively, barely any of them. You would have better luck cleaning the edges off by hand with a de-burring tool or in a shaker and then media blasting the part to soften all the edges.
Hope I didn't come off as harsh or anything, its just as an engineer that works for a very small engineering design/consulting outfit where we all are self taught machinist you start to gain a new respect for manufacturability. Feel free to PM me if you need any clarification or if you need any more help if you were planning on machining them yourself.
Good luck!
Questions
1) Concavity?
2) Material?
3) Have you carried out any FEA regarding the spindle or done the mathematics to spec out bearings based on whatever design you are running, this shouldn't be terribly difficult if you're an engineer?
Suggestions
The design isn't optimized for manufacturing let alone for something that is done as a possible one off. If there is any casting, the tooling cost will be very expensive. Even if you were to use something like DPT-Fast metal casting using plaster tooling the cost will still be high and I'm not even sure if they would offer cast aluminum or magnesium you would need to use. You also would likely need to redesign the pin webbing if the parts were cast. Take into account that you would need to perform final machining with multiple fixturing or use a mahine with 4-axis along with finishing and you have quite the operation for something that you want to make a few of.
If you are planning to mahine these you may want to increase the radius of the large inside pockets. Just looking at them they appear pretty small, so small that you would need to machine the pockets first with a larger tool and then finish mahine with a smaller tool that could break based on that pocket depth. It would increase machining time significantly = more expensive part. If you increase the radius between 1/8" to 1/4" you could do that pocket with only one tool and it would drop the maching time a bunch. Also, you would have to set-up the aluminum block in a vice or fixture twice to do 2 side-ops which although they are simple, is more machining time and if you aren't doing the maching yourself it means more $$$. Lastly, although the small fillet radius softens the part nicely for I.D. purposes, were you planning on machining it? You wouldn't be able to machine any of the radii except the ones that you are coming straight down at while machining, so effectively, barely any of them. You would have better luck cleaning the edges off by hand with a de-burring tool or in a shaker and then media blasting the part to soften all the edges.
Hope I didn't come off as harsh or anything, its just as an engineer that works for a very small engineering design/consulting outfit where we all are self taught machinist you start to gain a new respect for manufacturability. Feel free to PM me if you need any clarification or if you need any more help if you were planning on machining them yourself.
Good luck!
This entire pedal could be made on a 3 axis machine. I agree with the inside radii of the large pockets, however it's a concept rendering, not a finished design.
All small edge radii could be done with a corner radius tool. I designed the part to be CNC'd, so it's as simple as a tool change and another tooling path.
All the pockets, as you can see, are oval slots, which could be done in one pass each with a sharp 2 flute mill. They are also not perpendicular to the faces, but perpendicular to the X and Y axis of the pedal. This means the pedal does not need to be held at an angle when machining the slots, it can be held orthogonal to the base of a vise. Due to the simplicity there would be minimal fixturing needed. I could machine the first ones on a manual 3 axis if I felt so inclined.
Your media blaster/shaker idea is cool, but I don't know if they would "soften" the edges as much as I'd like, I think I'd want a defined radius.
Constructive input is always appreciated
idk about the ti and carbon for getting the hell beat out of them i know that with different materal i would deffiately buy them. but they look sweet
CoolThis entire pedal could be made on a 3 axis machine. I agree with the inside radii of the large pockets, however it's a concept rendering, not a finished design.
All small edge radii could be done with a corner radius tool. I designed the part to be CNC'd, so it's as simple as a tool change and another tooling path.
All the pockets, as you can see, are oval slots, which could be done in one pass each with a sharp 2 flute mill. They are also not perpendicular to the faces, but perpendicular to the X and Y axis of the pedal. This means the pedal does not need to be held at an angle when machining the slots, it can be held orthogonal to the base of a vise. Due to the simplicity there would be minimal fixturing needed. I could machine the first ones on a manual 3 axis if I felt so inclined.
Your media blaster/shaker idea is cool, but I don't know if they would "soften" the edges as much as I'd like, I think I'd want a defined radius.
Constructive input is always appreciated
I was assuming you would be doing this on a 3-axis. Still, I just see it as waisted machine time flipping over the part so much even in a vice. Your design right now would require just two additional side-ops assuming that the front through pocket goes through the axle portion of the pedal, but doing the radii you would have to hit all six sides, since there wold be no way to hit the bottom edges with a radii tool. A tumbler with the correctly sized coarse ceramic media (likely v-cylindrical or triangular) should functionally knock down the edges so they are soft enough. It's a pedal that spins on an axle so you don't need what is a relatively large radii, you just need it soft enough so that if your skin brushes past it, you won't cut yourself. Any impact with your shins would cause the pedal to spin and you'll get the pedal teeth cutting you up.
Also, looking at it for a second time, I am a bit concerned abut the integrity of the pedal body. Some simple FEA and a prototype pair to test should clear that, but I wouldn't be all that surprised if the body needed to be beefier.
I guess I don't know if your doing this as just a side project or if this is something a bit more serious. If the only real cost to you is material cost then go for it!! Keep us updated with your progress and good luck.