The latest treat for my bike...

[spikenipple]

is going to be this:
https://i49.photobucket.com/albums/f277/Spikenipple/Yoke_zpsdff4447a.jpg

I've just finalised the design and will be writing the CNC program on Monday
____________________
C50 > GN250 > XJ600 > SV650S K7 > 2001 RSV Mille R > MT-09, XR400R > 2005 Fireblade (trackbike) + 2022 MT-09 + ZXR400 race bike

[mysterious_rider]

Awesome! so how much would one of those set you back if you couldn't do it yourself?
____________________
KAWASAKIIIII

[spikenipple]

I'm not entirely sure to be honest. A quick google reveals a Tyga CNC top yoke on ebay for £199, Harris yokes for £500ish...

Looking at the Tyga yoke and how thin it is in places, I think mine is a little bit overengineered, especially as I'll be using 7075 ally (versus the Tyga's 6082 which is considerably weaker)
____________________
C50 > GN250 > XJ600 > SV650S K7 > 2001 RSV Mille R > MT-09, XR400R > 2005 Fireblade (trackbike) + 2022 MT-09 + ZXR400 race bike

[spikenipple]

Got halfway through running the first program to machine the underside today before the late shift came in and needed to run a production job on the machine.

Here's the fixture I CNC'd to use once the underside has been machined.

https://i49.photobucket.com/albums/f277/Spikenipple/IMG_1033_zpsb11073a9.jpg

Here's how far I got today...had a little fine tuning to do in the program halfway through.

https://i49.photobucket.com/albums/f277/Spikenipple/IMG_1143_zpse7bad019.jpg


More to follow on Friday hopefully! I have 2 blanks so will be filming the entirety of the machining process on the second one with the GoPro
____________________
C50 > GN250 > XJ600 > SV650S K7 > 2001 RSV Mille R > MT-09, XR400R > 2005 Fireblade (trackbike) + 2022 MT-09 + ZXR400 race bike

[spikenipple]

A bit more progress made today before I was kicked off the machine again at 10am. I programmed some stupid moves in that left a mark on the top left of the yoke as seen in this pic. Chamfers need to be run then it's time to turn it over and do the front

All of the excess material will come off when I mill the top face.

https://i49.photobucket.com/albums/f277/Spikenipple/IMG_1145_zps14ffc502.jpg
____________________
C50 > GN250 > XJ600 > SV650S K7 > 2001 RSV Mille R > MT-09, XR400R > 2005 Fireblade (trackbike) + 2022 MT-09 + ZXR400 race bike

[spikenipple]

oh and before anyone notices the missing half of the ignition barrel hole, the wrong size blanks were bought in so I made do with these. Once I've proven the program out properly I'll probably get a few more in. If anyone wants one for their SP-1...give me a shout.
____________________
C50 > GN250 > XJ600 > SV650S K7 > 2001 RSV Mille R > MT-09, XR400R > 2005 Fireblade (trackbike) + 2022 MT-09 + ZXR400 race bike

[spikenipple]

Today's progress!

https://i49.photobucket.com/albums/f277/Spikenipple/IMG_1162_zps67d05a1a.jpg

https://i49.photobucket.com/albums/f277/Spikenipple/IMG_1166_zpsc8deb83c.jpg

Under the bottom clamp I've milled a counterbore and 2.5mm chamfer where the top yoke nut sits, but I forgot to take a picture.
The gaping hole is a product of accidentally setting a Z-depth repeating macro value too high...definitely a good thing I have 2 blanks.
The joys of programming it long hand (and not checking it rigorously enough)

All that's left to do now is mill the angles on the top of the yoke, chamfer and slit the fork bores, and drill, counterbore and tap the holes for the clamp bolts. Should be done tomorrow with a bit of luck!
____________________
C50 > GN250 > XJ600 > SV650S K7 > 2001 RSV Mille R > MT-09, XR400R > 2005 Fireblade (trackbike) + 2022 MT-09 + ZXR400 race bike

[c_dug]

Very cool, I was tempted to do something similar on a hand mill before I realised I wasn't that good
____________________
I am a bellend, I am a man of constant sorrow, I am a gummy bear, I am a rock.

[spikenipple]

Forming radii and angles on a manual mill really are a massive pain in the ass. For something like this, the amount of fixturing it would take to get it anything like accurate would stop me doing it at all!

CNC = win
____________________
C50 > GN250 > XJ600 > SV650S K7 > 2001 RSV Mille R > MT-09, XR400R > 2005 Fireblade (trackbike) + 2022 MT-09 + ZXR400 race bike

[spikenipple]

Today's work. When I milled out the clip-on locating slots on the underside, I accidentally went too far (another variable misnumbering...) with one of them and it went further than the final thickness, hence the hole on the r/h side. All sorted for number 2.

The fork bores are chamfered, and one side has had the bolt holes counterbored, drilled and tapped. On Friday I will do the other side, slit both and then it's good to go after deburring

https://i49.photobucket.com/albums/f277/Spikenipple/IMG_1168_zps58238626.jpg
____________________
C50 > GN250 > XJ600 > SV650S K7 > 2001 RSV Mille R > MT-09, XR400R > 2005 Fireblade (trackbike) + 2022 MT-09 + ZXR400 race bike

[spikenipple]

All done!

https://i49.photobucket.com/albums/f277/Spikenipple/IMG_1180_zpsa85dbcd7.jpg

https://i49.photobucket.com/albums/f277/Spikenipple/IMG_1182_zpse9d5d531.jpg

https://i49.photobucket.com/albums/f277/Spikenipple/IMG_1181_zps5d86a68e.jpg


Oh and it fits too!

https://i49.photobucket.com/albums/f277/Spikenipple/IMG_1183_zps6e394b29.jpg


So. Things to change for version 2:

1. Alter rads/rad positions to increase wall thickness by ignition switch bolt holes
2. Set pocket depth correctly so it doesn't leave a gaping hole in the middle of the yoke...
3. Correct clip-on location hole depth and enlarge both slightly
4. Change the boring bar/cutting tip in the stem hole for a better finish

Overall I'm pretty pleased, especially considering it's the first attempt. A few tweaks and it'll be spot on
____________________
C50 > GN250 > XJ600 > SV650S K7 > 2001 RSV Mille R > MT-09, XR400R > 2005 Fireblade (trackbike) + 2022 MT-09 + ZXR400 race bike

[CHR15]

shiney!

whats your machine?
____________________
Turbocharged drag thing / project death weapon / GK73A
Ste: I'm not entirely sure how you'd go about verbally abusing someone with a potato but I'm sure it's possible.

[spikenipple]

Kitamura H600B. It's old, it's leaky and the spindle bearings are on the way out. Perfect for pissing about on though! Oh and it's running a 25 year old Fanuc 1M interface which has background edit graphics enabled...they usually work after turning the machine off and on again 3 times (at 5 minutes a time)
They won't let me loose on anything newer yet
____________________
C50 > GN250 > XJ600 > SV650S K7 > 2001 RSV Mille R > MT-09, XR400R > 2005 Fireblade (trackbike) + 2022 MT-09 + ZXR400 race bike

[spikenipple]

Number 2 is done
This one's a bit better.

https://i49.photobucket.com/albums/f277/Spikenipple/IMG_1189_zpsfc0bc639.jpg

https://i49.photobucket.com/albums/f277/Spikenipple/IMG_1190_zps4f739456.jpg
____________________
C50 > GN250 > XJ600 > SV650S K7 > 2001 RSV Mille R > MT-09, XR400R > 2005 Fireblade (trackbike) + 2022 MT-09 + ZXR400 race bike

[SQL]

Nice!

[daverwheeler]

Lovely job.

[daverwheeler]

Lovely job.

[spikenipple]

MK2 is in the works...

https://i49.photobucket.com/albums/f277/Spikenipple/VTR002_zps5507a4bd.jpg
____________________
C50 > GN250 > XJ600 > SV650S K7 > 2001 RSV Mille R > MT-09, XR400R > 2005 Fireblade (trackbike) + 2022 MT-09 + ZXR400 race bike

[bladerunner]

You has a B axis! Well I'm guessing you do by the milled angles nice project!
____________________
Current bikes...cbr929, KDX200's, Rd125lc mk2, RGV250's

[CHR15]

have you done any fea?
____________________
Turbocharged drag thing / project death weapon / GK73A
Ste: I'm not entirely sure how you'd go about verbally abusing someone with a potato but I'm sure it's possible.

[spikenipple]

I've done some very basic (stab in the dark basically) FEA based on a unidirectional force of 5000N within the fork bores and a fixed point as the stem bore. It pissed it no problem, but the process of putting through the FEA was a bit like this:

https://s.mlkshk.com/r/97VP.jpg

so needless to say i'm quite certain the results are irrelevant.
____________________
C50 > GN250 > XJ600 > SV650S K7 > 2001 RSV Mille R > MT-09, XR400R > 2005 Fireblade (trackbike) + 2022 MT-09 + ZXR400 race bike

[CHR15]

out of interest, can you get off cuts of 7068 round bar? all my normal places want to sell me a length but i only need about 500mm of 40mm diam.
____________________
Turbocharged drag thing / project death weapon / GK73A
Ste: I'm not entirely sure how you'd go about verbally abusing someone with a potato but I'm sure it's possible.

[spikenipple]

Nah fraid not, we tend to use the 'just-in-time' approach towards most things now. Have you tried Metalweb?
____________________
C50 > GN250 > XJ600 > SV650S K7 > 2001 RSV Mille R > MT-09, XR400R > 2005 Fireblade (trackbike) + 2022 MT-09 + ZXR400 race bike

[CHR15]

will give them a call on monday. dont think we've ever used them before.
____________________
Turbocharged drag thing / project death weapon / GK73A
Ste: I'm not entirely sure how you'd go about verbally abusing someone with a potato but I'm sure it's possible.

[spikenipple]

The correct size blanks for this job (285x130x46) cost £25 each from Metalweb when buying 5, which is a bit of a bargain for 7075. 7068 isn't listed but they can probably get it for you.
What are you making that needs something that strong?
____________________
C50 > GN250 > XJ600 > SV650S K7 > 2001 RSV Mille R > MT-09, XR400R > 2005 Fireblade (trackbike) + 2022 MT-09 + ZXR400 race bike