Bike adjustable dropout/caliper bracket

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rider_mortagnais
Posts: 31
Joined: Sat Oct 11, 2014 11:10 am
Location: The Netherlands

Bike adjustable dropout/caliper bracket

Postby rider_mortagnais » Wed Nov 25, 2015 10:56 pm

Hi all,

I will show my project that is about to be finished, first, some explanation :
- what is it about? a bike part
- which one? the rear disc brake caliper holder
- which standard/diameter? Post Mount 180mm
- why don't you change your adapter? because I'm fed up with adapters!! I want a 1 piece construction, light and STIFF!
- can't you buy this dropout?? nope, the (french) bike brand went bankrupt at least 5 years ago!
- is it worth the time/money spending??? ENOUGH with these stupid questions :lol:
:arrow: of course it's worth it, learning using FreeCAD and helping the community are worth a few hours/$ extra! ;)
+ the home made, one-off is exciting!!

Ok, let's look at the pics instead of talking!

The bike I built...almost 2 years ago already?? :shock:
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Details on the adjustable rear dropouts :
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As it is now, International Standard (axial) + Post Mount (radial) adapter for the caliper, 160mm disc :
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:idea: Let's go to the CAD side of the force, stock dropout on FreeCAD :
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Rough 3D modeling of the adaptor (IS to PM) on a random frame :
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Early design of my part :
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Another trial :
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After a review with a friend, I changed the way of building the part, and the design looked like this :
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Another review later...as it was too far from the original spirit of the bike (my friend also owns one of this brand) :
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In this topic there are more details about the final shape :
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In this topic, you can find more FEM pics :
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I then contacted a colleague to 3D print what I wanted to validate, before sending to my friend in the machine shop :
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Put it on the bike to check :
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I did some minor modifications since then, and I am busy with the 2D drawings :
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Last edited by rider_mortagnais on Fri Jan 29, 2016 7:03 pm, edited 1 time in total.
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rider_mortagnais
Posts: 31
Joined: Sat Oct 11, 2014 11:10 am
Location: The Netherlands

Re: Bike adjustable dropout/caliper bracket

Postby rider_mortagnais » Wed Nov 25, 2015 11:18 pm

If somebody wants the file :
TRIAL that fails.FCStd
a bit messy inside!!!
(183.53 KiB) Downloaded 96 times
PrzemoF wrote:Please excuse me that little off-topic :) FEM wb with VT by ickby:
Image
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DeepSOIC
Posts: 7056
Joined: Fri Aug 29, 2014 12:45 am
Location: Saint-Petersburg, Russia

Re: Bike adjustable dropout/caliper bracket

Postby DeepSOIC » Wed Nov 25, 2015 11:31 pm

Fantastic!
rider_mortagnais
Posts: 31
Joined: Sat Oct 11, 2014 11:10 am
Location: The Netherlands

Re: Bike adjustable dropout/caliper bracket

Postby rider_mortagnais » Thu Nov 26, 2015 10:35 pm

Thank you master! :oops:

I was checking what you did/are doing...it's another level! ;)

Here is where I am tonight :
Image
Newbie in CAD!
rider_mortagnais
Posts: 31
Joined: Sat Oct 11, 2014 11:10 am
Location: The Netherlands

Re: Bike adjustable dropout/caliper bracket

Postby rider_mortagnais » Sat Nov 28, 2015 12:13 pm

Little update to tell how it's done, as I only gave the .step file made with this :
Download link to construction process

I started with late 0.15 dev and upgraded a few times during the modeling of my part.

WHICH VERSION DO I HAVE?
OS: Windows 7
Word size of OS: 32-bit
Word size of FreeCAD: 32-bit
Version: 0.16.5942 (Git)
Build type: Release
Branch: master
Hash: c9cfc369d6eb00529deb7c04a2e20e436523e0b6
Python version: 2.7.8
Qt version: 4.8.6
Coin version: 4.0.0a
OCC version: 6.8.0.oce-0.17

HOW DID I DO?
I used mainly the PartDesign WB :
1. I created a 2D sketche and extruded a simple pad out of it
2. I then created many successive 2D sketches, applied to the wanted face and then did pockets.
3. Once I was done, I did the fillets
Sometimes I had to use OpenSCAD WB to refine the shape.
After a design review, I did some strange things to just add volume to the part...(from "Départ" fillet until the end)
--> The last object is : "refine_Pad003", that I exported as .step (see file at the beginning of the topic), working with the 3MB project was not so convenient!!

HOW LONG DOES IT TAKE TO OPEN?
The 3MB file takes 1min to open on my computer (Core2Duo @3.00GHz/4GB RAM)
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triplus
Posts: 8752
Joined: Mon Dec 12, 2011 4:45 pm

Re: Bike adjustable dropout/caliper bracket

Postby triplus » Sat Nov 28, 2015 2:06 pm

Looking good.