Teach me to send emails without looking. *DRIVESHAFT side, no aircraft. Going to go check out a machine shop on Wednesday before an optometry appointment, see what they'll run me to make the cuts and do the lathe work.
Kurt On Aug 13, 2012 8:05 AM, "Kurt Nolte" <vturbine.po...@gmail.com> wrote: > I thought on it some more, and with the sleeves I plan to use I can get > away with really simple cuts on each side of the swingarm. The sleeve on > the aircraft driveshaft side will take care of the lip. > > Then it's a matter of getting the sleeves turned down and one bushing in > the rear needs a slope cut into it. > > Shouldn't be expensive. > > Kurt > On Aug 13, 2012 7:50 AM, "Allen Thomas" <althomas...@gmail.com> wrote: > >> ** >> Man you're in deep, good luck with it. >> Sent via BlackBerry by AT&T >> ------------------------------ >> *From: * Kurt Nolte <vturbine.po...@gmail.com> >> *Sender: * nighthawk_lovers@googlegroups.com >> *Date: *Sun, 12 Aug 2012 14:13:21 -0400 >> *To: *<nighthawk_lovers@googlegroups.com> >> *ReplyTo: * nighthawk_lovers@googlegroups.com >> *Subject: *Re: [Nighthawk Lovers] The Great CB650SC update >> >> Update minus pictures, the camera's still in the garage all set up. I'll >> get pictures later once I have time to resize them and >> >> The left side pivot bolt takes a 14mm allen bit. The right side is a 10mm >> allen, and a 23/24mm or 1" deep socket can be cut down to make the tool for >> the locking nut. I cut down a gearwrench 23mm deep 3/8" drive socket, using >> a 1.25" speedbor bit and some scrap wood to make a template to align the >> keys. They're ~10mm wide and located at an easy 90* from each other: four >> lines on a square of wood, drill down the middle, cut off the 6-point >> section of the bit to get to the meatier part of the socket, mark and cut. >> Freehanded it well enough with an angle grinder and a cutoff wheel. >> >> When I got the two swingarms out and side by side, there was an immediate >> issue: the Sabre swingarm is ~1.5" wider at the pivot than the CB650 >> swingarm. HOWEVER, the Nighthawk arm does not butt against the frame on >> both sides; actual clearance difference is closer to 1/4" rather than the >> 1"+ the width difference suggests, especially once the step is accounted >> for on the Nighthawk arm. >> >> The bearing diameters are different, that was obvious; the Nighthawk uses >> NSK 30202 bearings (15x35x11.75mm bore diameter X outer diameter X depth) >> while the Sabre uses 30203J bearings (17x40x12mm). There is also not enough >> thickness to the Sabre arm tube to machine the step on the shaft side, >> though there is PLENTY of depth on the brake side to cut down for clearance. >> >> Given my original intention to leave the Nighthawk frame intact, only >> adding tabs and not cutting any part of the frame, I have a plan. I'm going >> to have the Sabre swingarm cut to make clearance, then I will fit a steel >> sleeve bushing into each side, sized to allow me to continue using >> Nighthawk bearings, seals and grease retainers. Since I am not increasing >> the weight of the bike in any significant way, these will be fine. These >> sleeves will allow me to machine the step on the driveshaft side, and give >> me some additional thickness on the brake side. >> >> A stock Nighthawk right side pivot bolt can easily be cut down and >> machined to accept the closer frame, and should actually be stronger for it >> with less lever arm. >> >> Sleeving to use the Nighthawk bearings allows me to use stock, readily >> available bearings and seals. Using the bearing codes means they're >> ~$16/each versus $45+ at a motorcycle site or dealer, and this isn't >> "direct from China" pricing either; that's $3 each. Not worth it to me, I'd >> rather have "Made In Japan," "Made In Germany," or "Made In USA" on my >> bearings. >> >> My ONLY concern with this is the difference in tube centerlines for the >> driveshaft tubes. The Nighthawk arm has a tube centerline, measured from >> the flat outer face of the bearing tube, of 1.7". The Sabre swingarm, >> measured similarly, is 2.4", for a difference of .7". >> >> I obtained these centerlines by clamping a straight edge to the bearing >> face on the outside of the swingarm, then measuring to a straight edge held >> against each wall of the driveshaft tube. There may be an issue with my >> methodology. 1.7" does not appear to put the driveshaft universal joint in >> any danger of scraping or rubbing on the outside of the Sabre swingarm >> tube, though that .7" difference does mean that the joint will be operating >> at a bit of an angle. Are there shims I can remove to move the angle drive >> closer to the transmission before we enter the swingarm? I am also going to >> try getting a little bit of material taken from the Sabre arm to reduce >> that distance, but I can't take more than a 1/4" that way, IF that. Will >> still leave me nearly 1/2" out of alignment, but only on the driveshaft >> tube centerlines, not necessarily the the driveshaft itself. >> >> Looking at the way the driveshaft sits in the Nighthawk tube with the >> final drive case installed, it rides really close to the edge of the tube >> anyway rather than down the centerline. The Sabre has an extra .4" of >> clearance on that side (1" even from outer face to inner tube wall vs. >> Nighthawk's 1.4"). I think I'll be fine. >> >> On a non-swingarm (or perhaps tangentially related) I will be building a >> bracket to move the rear brake pedal assembly 1/2" further from the frame. >> This will let me mount the rear master cylinder where it won't interfere >> with the swingarm's movement, and looking at where the footpad ends up it >> won't be a problem for my big foot. >> >> Any thoughts, ideas, questions so far? >> >> -Kurt >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Nighthawk Motorcycle Lovers!" group. >> To post to this group, send email to nighthawk_lovers@googlegroups.com. >> To unsubscribe from this group, send email to >> nighthawk_lovers+unsubscr...@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/nighthawk_lovers?hl=en. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Nighthawk Motorcycle Lovers!" group. >> To post to this group, send email to nighthawk_lovers@googlegroups.com. >> To unsubscribe from this group, send email to >> nighthawk_lovers+unsubscr...@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/nighthawk_lovers?hl=en. >> > -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. 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