SOHC.co.uk Forums > CB350/400

Cross drilled discs

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Laverdaroo:
I dont know why I dont just buy em and stop faffing about, I know I'll end up with a set before the builds done ;D
I'd be interested in looking at your emulators when you've fathomed it out.

allankelly1:
Yes I would be interested

Also now I have the Dresda box section swing arm that runs on taper bearings things with good shocks at the back. There should be a better back end hence needing to sort out the front

Catch up soon Al


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Laverdaroo:
Theyd do that on a mill wouldnt they Ken, surely?
By the way I'm not trained on a lathe either  ;) 8)

I use this chap for my bits ne bobs and he did teh snapped bolt extraction and thred replacement for me. His workshop is like the spaceship Enterprise. He's wel regarded down this way and always really busy doing his core work on cranks and teh likes but he does stuff when you ask hiom and he's more thanqualified, some of the stuff he manages in there is awesome.
 Ask for Dave and tell him its me thats put you onto him, he should be really helpful. He's a 'one and a half' man band so you'll get his answerphone more than likely but he always rings you back.

https://www.dyengineservices.co.uk/

Laverdaroo:
It's the same down here. Lathe is circular motion, a mill has the part clamped flat and the bit moves over it, hence straight lines etc are achievable. Bit of a monster router if you like.
You have to sift  through a few to get a good one but some of the instructional vids on You tube are invaluable, even just for hacks. The 'Shermans' tend to go into the nth degree and piss about with 32nds and 64th's and it gets very confusing but some of the british lot are quite good. I tend to look when I need to as once Youtube opens up I'm guaranteed a late night down an i'nfo worm hole'. If I have an issue or a question I'll look it up on there.
 Usually helps immensely.
 I learnt what little I know from playing on a pals; he bought a 6' bed 12 speed monster from the Vickers tank factory in Leeds when they flattened it. It's still running today and I think it was built in 1930 odd. When ypu build in the 'nod' of the chuck and build it into your equation its fine. Ive only got a bench top Clark jobby but its really good for the money. Ive put some bits on it like a better tool holder and a bracket to make the body more ridged but it t urns a treat. All I would say is that if youre going to invest, get one with metal gears as the plastic ones shatter just for fun.

I generally only make spindles and spacers and a few cupped brackets for this and that and the like, its terribly satisfying. Practice with nylon blanks first and when happy fire out one in steel or ally.  Be warned, once you start you'll find stuff that needs making on the lathe every day. Terribly, terribly addictive! :D
 ;D ;D

K2-K6:
"Mill or Lathe it's all the same to me, no idea how they work, I'm looking for a night time course on them near me but bo one seems to do it, which is weird."

Yep, as above Lathe turns the material and tool stays still, everything comes out roundy roundy and normally concentric  ;D if all the bearings are ok.

Mill, the material is clamped with the tool spinning (various shapes) to generate ordinarily flat surfaces in it's basic form.

Disc slots,  you'd ordinarily use a slot mill/end mill bit (like a drill bit but flat end usually) to drop into surface and move the disc along to make the slot.
Just a face slot with blind ends (finishing within the boundaries of the brake surface) you'd probably use a bull nose (rounded tip) end mill to give the slot radius and not leave sharp stress raisers at slot ends.
Slot going to the end of brake surface less critical and so could be square in form shape. We often did this to rear disc on 750s when contemporary as it clears the disc of crud in wet weather effectively, and going right to the outside will expell rain and dirt really well. Often you'd see this type of slot on rally car discs for conditions they run in.

For the holes, on a mill Allan mentioned you'd use a device a bit like a record player in orientation that's mounted on mill bed. Then fix the disc to it and you can rotate the disc prescribed amounts (with a handle and index plate) to make holes dispersed around the disc based on inbuilt geometry of the indexing plate. It's quite easy for someone with the right kit.

As mentioned about metalwork machining, went to see a college with my son a couple of years ago and get shown round the facilities. Walked through a big workshop with 20 lathe and 10 mill machines and I quote the guide " yeah these old machines you won't get to use, nobody trains on them now"  :-\  sadly, most only want to learn computer driven headline processes now.

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