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Author Topic: CB450 Tracker  (Read 7940 times)

Offline 1fasgsxr

  • Posts: 1338
Re: CB450 Tracker
« Reply #60 on: Dec 12, 2017, 09:41:58 »
We need a drooling emoji !!

Offline Pete12

  • Posts: 138
Re: CB450 Tracker
« Reply #61 on: Dec 16, 2017, 06:06:58 »
We need a drooling emoji !!
Haha, thanks very much.

I bought an English Wheel a while ago (well, actually Chinese Wheel if the truth be known), and gave it its maiden run today for the front mudguard. I had a bit of scrap aluminium so, after a fairly steep learning curve, ended up with this:

https://i.imgur.com/A9u4nRt.jpg[/img]]

It's not the final piece as it's neither long enough or wide enough, so I will start on that next. The wheel seems to work OK but as it's manufactured and not forged it flexes quite a bit. Seeing that I will probably be only doing small parts on it (no E type Jag bonnets for this boy) I will put some stiffening braces in so that the wheel gap remains more constant which should make it easier to use. Unexpectedly, it bit me a number of times, so I need to treat it with the respect it deserves.

I tried all sorts of different things and somehow managed to get the curve to match the tyre OK (very important IMO) so I'm hoping I can reproduce the result on the final article.

Offline Pete12

  • Posts: 138
Re: CB450 Tracker
« Reply #62 on: Dec 19, 2017, 01:55:10 »
Far too hot to even think about making a mudguard or tank tunnel here today so I decided to make a new points cover, a nice easy job on the milling machine. I traced around the original cover and then scanned the sketch, converted it into a .dwg file and picked up all the coordinates in AutoCAD. Then it was just write the program on the mill and machine it up.

https://i.imgur.com/q21Hdlf.jpg[/img]]

I left the end open and rebated so that I can fit a perspex disc to it and watch the points arcin' and a sparkin'....

https://i.imgur.com/1WrGoj4.jpg[/img]]

https://i.imgur.com/XdINDJ3.jpg[/img]]



« Last Edit: Dec 19, 2017, 01:56:45 by Pete12 »

Offline JB56

  • Posts: 5
Re: CB450 Tracker
« Reply #63 on: Dec 19, 2017, 21:13:38 »
 Wow, I haven't seen this for a while.  Amazing build!!
The points cover is a work of art..  Should be in the Guggenheim...

Offline JB56

  • Posts: 5
Re: CB450 Tracker
« Reply #64 on: Dec 19, 2017, 21:17:47 »
On the subject of the points cover what are your plans for the motor finish??
Black barrel with filed fins? Bead blasted cylinder head or black head? Black motor or polished alloy??
Have you made a decision on that yet??
Amazing work so far.  I think we would all like to know more how you converted a scanned piece of paper into a goddam points cover??

Offline Pete12

  • Posts: 138
Re: CB450 Tracker
« Reply #65 on: Dec 20, 2017, 18:11:35 »
Thanks JB56.

Haha, points cover in the Guggenheim. If you haven't already, check out the current bike of the month. Now there's a work of art.

The plan for the motor at this stage is black with all the small covers polished and s/s retaining screws, and the end of the fins sanded. I've seen a few like this and they look really good. This of course, is subject to change as we really haven't finished the final colour plan yet.





Offline Pete12

  • Posts: 138
Re: CB450 Tracker
« Reply #67 on: Jan 15, 2018, 05:46:48 »
Late to the party, but very happy to join in.
Thanks Irk, welcome aboard..

I'm waiting on the seat to arrive from the US, which I need before I can do the rear loop or the tank mounts, so I made the first part of the gear lever. I got a short length of aluminium round bar and set it up in the mill and machined the shape into it,
https://i.imgur.com/JB91Z2k.jpg[/img]]

I then bored a hole in it with the diameter of the hole being equivalent to the spline minor diameter,
https://i.imgur.com/Klg2dIX.jpg[/img]]

and then found a brake cam shaft with the same spline as the gear lever and pressed it in until it bottomed out in the hole.
https://i.imgur.com/nyGyvHQ.jpg[/img]]

Once I pushed it back out I ended up with a nice clean spline.
https://i.imgur.com/UsIqujd.jpg[/img]]

Then it was a matter of cutting the slot using a slotting saw,
https://i.imgur.com/RtZw8aQ.jpg[/img]]

and then drilling and tapping the clamp bolt hole.
https://i.imgur.com/Lr30IV8.jpg[/img]]

Once I have positioned the footrests I can make the arm the correct length and weld it onto this piece. I will make the toe part the same size as the original so I can install an original rubber.



Offline LiamG6

  • Posts: 4
Re: CB450 Tracker
« Reply #68 on: Jan 15, 2018, 08:41:00 »
Really nice work mate, living the dream by the way with the mill etc. Good setup. I'm in oz and building a CB450 too. Bike looks fantastic so far and can't wait to see what else you do with it.

I noticed you used the left rear cam cover on the front right to remove the tacho drive, did you drill an oil hole in it to transfer oil from the cover to the cam itself? You'll need to do that unless you are moving to external oil lines like capellini stuff etc. I'm going with a digital acewell speedo/tacho so I'm making the same change. Was just going to size the oil hole the same as the combined area of the 2 holes in the old tacho drive cover. Was also going to make a jig to transfer the cam timing mark onto the new cover. Getting the angle of the oil hole right is the tricky part, to make sure the oil comes out right at the end of the cam journal. I'm ignoring the fact that the oil spiral inside the cam cover journal is now rotating in the wrong direction, time will tell if that causes issues.

Anyways, I'll be following along admiring your work, very impressed so far!
« Last Edit: Jan 15, 2018, 08:44:31 by LiamG6 »

Offline Pete12

  • Posts: 138
Re: CB450 Tracker
« Reply #69 on: Jan 15, 2018, 19:27:30 »
Hi Liam,
I have only got up to the stage of seeing if the cover would physically fit, but I'd had a look at the lubrication diagram for the top end and appreciate the need for the oil hole and also the mark for the valve timing, but hadn't given any thought at all to the helical groove inside the journal, which may well be a showstopper. I have a tiny little right angle porting die grinder so I will have a go at doing one by hand on one of my spare covers and go from there. Obviously there will be crossovers between the two paths but the direction of rotation should take care of that.
Thanks very much for taking the time to comment, you've quite possibly saved me a cam and journal.