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11
Project Logs / Re: Board track racer
« Last post by tom osselton on December 10, 2017, 03:34:14 PM »
Interesting so are the spokes tapped into the hub or do you insert nipples through the hub?
12
CNC / Re: DDCSV1.1 4 Axis controller
« Last post by Will_D on December 10, 2017, 07:44:32 AM »
In order to machine circular paths do the x and y steps per mm have to be the same even if the two lead screws are different pitches ( compensated by micro steo settings)?

That is params #34 and #35 are the same

Any comments on post #776 above re. backlash?

Cheers

Will
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Tools / Re: Santa Came Early
« Last post by Joules on December 10, 2017, 07:06:35 AM »
Some 6hrs after applying the JB Weld, I use a razor blade to carefully scrape back and get things flush.  Extra care is taken on the horizontal bar so you don't scratch it.  The results are very pleasing on the bar, the finish is flush and you can't feel an edge.  With a nail you can feel the transition from metal to filler but I don't want to buff it and risk marking the bar, time will polish the surface.

The cross slide top once filled and some dirty oil rubbed over it, the filler nearly disappears.  However I managed to break a small bit of filler off the dovetail edge.  I will fix it if I need to use anymore filler, otherwise leave it as is.

I fixed the bar adjuster, it was the dial that had grit in it.  Clean and re grease solved the grittiness, the tight spots are reduced but I can still feel them, maybe they will disappear with time as things bed in.   Just some work to do on the collet holder and the head will be done.  Then design and print some dust covers for the larger threaded bosses.  I will probably use hot glue to plug the grub screw holes as it's easy to pick out when the time comes.

   
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Project Logs / Re: Board track racer
« Last post by OKTomT on December 09, 2017, 07:01:33 PM »
Mark the die is split so that when a spoke is in it and put in a vice it squeezes on the spoke and holds it firm then the end of the spoke is heated and forged in to the die see picture.
 
I have have been working on truing the wheels . I got the front one done and mounted the tire. they are Avon Speedmaster 3.00-21
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Tools / Re: Santa Came Early
« Last post by Joules on December 09, 2017, 04:21:35 PM »
On the subject of using JB Weld, for applications like this, I prefer to heat up the casting to 40℃ or there abouts.  This helps the JB Weld flow better, pushing it into the hole with a toothpick and the heat lets any bubbles expand and pop on the surface.  Finally it reduces the cure time some, but still allows working time with the small amount mixed.  I did 2 peas worth for filling.   The JB weld will be left for a few hours to partially cure and be levelled with a razor blade.  Tomorrow I will just tickle it with a riffler file to make sure its not proud of the surface.   A few other places need some filling, which wasn't a problem as I had plenty left over from the mix.

Final part of filling for tonight was on the tool post horizontal bar.  They but a bolt though that holds the tension spring for the bar, but then rough grind the bolt to get it below the surface.  This is down right ugly and pretty much defeats the bar seal on the tool post, so I added filler and will carefully blend it back to the bar profile.  I hope that will preserve the seal as it won't get ragged or pick up grit from the afore mentioned hole.


 
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Tools / High speed drill attachment for lathe
« Last post by Doc on December 09, 2017, 04:14:58 PM »
Ok started working n my high speed drill plan for my lathe. Hopefully it will work. I am waiting for a small drill chuck that I ordered but I figured I could get started.



https://youtu.be/vYKQkiL7g84




<a href="http://www.youtube.com/watch?v=vYKQkiL7g84" target="_blank">http://www.youtube.com/watch?v=vYKQkiL7g84</a>
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Tools / Re: Santa Came Early
« Last post by Joules on December 09, 2017, 04:08:04 PM »
Managed to sit down and loose 5hrs fettling today.   My other half, bless her, let me setup the B&D Workmate in the kitchen to do the work on the grinder.  Having put the plug on it and made sure nothing fouled the wheel, a quick run to see how it sounded and how much vibration.   Not at all noisy and the mass of the thing meant almost no vibration, I guess the grind stone is pretty close on, but a later job is to pull it off and rebalance.

I've started by stripping down the tool post/head assembly.  You can see in the springs picture the new finger hammer has had some use tapping parts loose and removing pins etc.  I had to clean off the thick grease with included abrasive particles, I replace this with LM2, making sure everything is cleaned.  You can see the diamond stones and drill I used to remove burrs and clean mating surfaces.  You don't need to de burr, but I would rather they didn't work loose sometime in the future so for me it's a job worth doing now.   The horizontal motion of the grinding wheel is nice and smooth, however the lower tool post bar is gritty and has some tight spots, they will be dealt with later.

Last picture is some of the casting defects I found, nothing serious but I like to pick the loose stuff out and fill them with JB Weld.  This serves dual purpose, to seal in any further loose bits and stop dirt finding its way into a hiding place for later escape.



 
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Project Logs / Re: Board track racer
« Last post by Kjelle on December 09, 2017, 04:08:15 AM »
Harder to explain than the concept is... Oval track, built from boards (wood, aka "brown stuff"). Follow the link; http://flashbackfab.com/excelsior-homepage/
This is one heck of a build!

Kjelle
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Tools / Re: Santa Came Early
« Last post by Joules on December 08, 2017, 07:18:04 PM »
LOL the more you do Norman, the more you forget about the lack of confidence you had when you started.  Keep practising, and learn that good enough, can be good enough.  I no longer aim for perfection but what I am comfortable with that will get the job done.   Suddenly you find you take away all that peer pressure.  OK so somtimes your work isnít as good as the next guy.  Well if your life doesnít depend on it, so what.  That isnt to say you should be complacent, but always try your best, be humble and learn.
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CNC / Re: DDCSV1.1 4 Axis controller
« Last post by ugv on December 08, 2017, 05:02:39 PM »
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