Homemade Parts!

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Homemade Parts!
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flag Mr-Magura
Posted: Feb 11, 2019 at 14:46 Quote
secondtimeuser wrote:
I feel your pain. Non-standard bolt lengths are a blight.

Or a weapon against after market parts.
.....but mostly just the work of a daft engineer.

They are in the same class of engineers, that puts a very fine tolerance, as the standard for the entire part, because he's too retarded to figure that it increases the manufacturing cost by an order of magnitude in most cases.

A pretty good argument for birth control!

Magura Smile
flag secondtimeuser
O+
Posted: Feb 11, 2019 at 18:17 Quote
That's maybe a bit far, it can be quite useful to be able to walk in to a new job and be able to say "I can cut production costs by 20%" because all you need to do is take some 0s off the drawing!
flag Kustomango
O+
Posted: Feb 13, 2019 at 3:38 Quote
secondtimeuser wrote:
That's maybe a bit far, it can be quite useful to be able to walk in to a new job and be able to say "I can cut production costs by 20%" because all you need to do is take some 0s off the drawing!

Use for the engineer, not for product, consumer or company, especially if specing longer and larger bolts and the appropriate increase in machining only costs a fraction more.

Thomson may have saved a few pence and a few grams on their stem, but have lost what was once a devoted following for stems and posts, which is now just the few mtbers that ride a fixed post and want to spend more than a dropper...
flag ktm87
O+
Posted: Feb 13, 2019 at 9:55 Quote
working on some crowns that allow you to adjust the offset by +/- 10mm

these are the first prototype, next one is gonna have alot of changes. i like these but not very happy with them

Offset adjustable crowns for Dorados I m working on. Boxxers coming next.

Offset adjustable crowns for Dorados I m working on. Boxxers coming next.
flag inked-up-metalhead
Posted: Feb 13, 2019 at 10:38 Quote
Raw machined aluminium is porn.


Just sayin'.
flag taquitos
Posted: Feb 13, 2019 at 10:44 Quote
ktm87 wrote:
working on some crowns that allow you to adjust the offset by +/- 10mm

these are the first prototype, next one is gonna have alot of changes. i like these but not very happy with them
Given the forces that are in line with that slot or act about one of those interfaces I would be surprised if it didn't slip eventually if you are clamping the steer tube in there. If you are putting something similar to a flip chip in I suppose it could work out, but the slight bit of play would weird me out. Anyway around you're going to lose a fair bit of stiffness. Also no pinch clamp for the sanchions? I'll be honest the adjustability at that interface sketches me out. Making four different versions with four different offsets seems like it would be the way to go.
flag ktm87
O+
Posted: Feb 13, 2019 at 10:52 Quote
taquitos wrote:
ktm87 wrote:
working on some crowns that allow you to adjust the offset by +/- 10mm

these are the first prototype, next one is gonna have alot of changes. i like these but not very happy with them
Given the forces that are in line with that slot or act about one of those interfaces I would be surprised if it didn't slip eventually if you are clamping the steer tube in there. If you are putting something similar to a flip chip in I suppose it could work out, but the slight bit of play would weird me out. Anyway around you're going to lose a fair bit of stiffness. Also no pinch clamp for the sanchions? I'll be honest the adjustability at that interface sketches me out. Making four different versions with four different offsets seems like it would be the way to go.

theres a chip in the center. it wont have full length steerer tube rather the chips will have a nub to fit into the headset similar to the way intend does it on there infinity fork. there is clamps on the stanchions, the slots just arent machined yet in the pics.
flag taquitos
Posted: Feb 13, 2019 at 11:30 Quote
ktm87 wrote:
taquitos wrote:
ktm87 wrote:
working on some crowns that allow you to adjust the offset by +/- 10mm

these are the first prototype, next one is gonna have alot of changes. i like these but not very happy with them
Given the forces that are in line with that slot or act about one of those interfaces I would be surprised if it didn't slip eventually if you are clamping the steer tube in there. If you are putting something similar to a flip chip in I suppose it could work out, but the slight bit of play would weird me out. Anyway around you're going to lose a fair bit of stiffness. Also no pinch clamp for the sanchions? I'll be honest the adjustability at that interface sketches me out. Making four different versions with four different offsets seems like it would be the way to go.

theres a chip in the center. it wont have full length steerer tube rather the chips will have a nub to fit into the headset similar to the way intend does it on there infinity fork. there is clamps on the stanchions, the slots just arent machined yet in the pics.
Hmm I still think stiffness will be low compared to a standard crown. Especially if you have a through bolt from one chip to the other like the intend. If you were to bolt the chip straight to the crown with four bolts it would be more rigid.
flag ktm87
O+
Posted: Feb 13, 2019 at 11:42 Quote
taquitos wrote:
ktm87 wrote:
taquitos wrote:

Given the forces that are in line with that slot or act about one of those interfaces I would be surprised if it didn't slip eventually if you are clamping the steer tube in there. If you are putting something similar to a flip chip in I suppose it could work out, but the slight bit of play would weird me out. Anyway around you're going to lose a fair bit of stiffness. Also no pinch clamp for the sanchions? I'll be honest the adjustability at that interface sketches me out. Making four different versions with four different offsets seems like it would be the way to go.

theres a chip in the center. it wont have full length steerer tube rather the chips will have a nub to fit into the headset similar to the way intend does it on there infinity fork. there is clamps on the stanchions, the slots just arent machined yet in the pics.
Hmm I still think stiffness will be low compared to a standard crown. Especially if you have a through bolt from one chip to the other like the intend. If you were to bolt the chip straight to the crown with four bolts it would be more rigid.

i agree with you, this is just the first prototype and i already have quite a bit of changes for the next set. adding bolts for the chip is on the list
flag taquitos
Posted: Feb 13, 2019 at 13:36 Quote
ktm87 wrote:
i agree with you, this is just the first prototype and i already have quite a bit of changes for the next set. adding bolts for the chip is on the list
Make sure you put lots of work into determining proper thread engagement or these people will eat you alive haha
flag JVance
Posted: Feb 19, 2019 at 11:53 Quote
Low-tech mount for my RS-1 lock-out on a set of Salsa Woodchippers:
photo

photo
I used a ~1" stub of carbon handlebar that I trimmed when narrowing my bars; a piece of sandpaper wrapped around a seatpost to contour the base, and it sits on a circle of old inner-tube. The zip-ties were new.
flag monkeyboyjc
Posted: Feb 21, 2019 at 7:17 Quote
That's a great idea....
flag ktm87
O+
Posted: Mar 8, 2019 at 10:55 Quote
stem im working on, first prototype. pretty rough. final version will be titanium

First Enduro stem rough prototype
First Enduro stem rough prototype
flag Mr-Magura
Posted: Mar 8, 2019 at 11:14 Quote
Looking good, but be careful about the cutouts on the back of the bars. That I would expect to end poorly.
You can make the cutouts, but you need to support the bars around the entire circumfence.

Magura Smile

 


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