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9th December 2013, 06:59 AM #1
Dressing and aligning a Lucas Slabber
Had a little bit of work to do on the slabber over the weekend, so I thought I'd get some stuff up here for everyone...
Dressing the bar - I've done this a few ways in the past, if it's not much to dress, I've done it by hand with a chainsaw file, or if it's worn a bit, I've used the angle grinder again by hand, but this is by far the best result. I used a table saw!!! with a sandpaper blade instead of a cutting blade attached, check out the video
The deck on the table saw is set 90 deg to the sandpaper blade and the bar is laid flat on the table and slowly fed past the sandpaper.
After taking the bar off and dressing it, the bar then needs to be aligned to the carriage after being installed again.I love my Lucas!! ...just ask me!
Allan.
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9th December 2013 06:59 AM # ADSGoogle Adsense Advertisement
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9th December 2013, 10:55 AM #2.
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Looks good sidgi!
I use an 8" grinding wheel in the same way as you do for dressing bars but your method looks better.
I recently picked up a bunch of old 9" saw blades for nothing that am going to use for various tool projects and I think I will grind the teeth off one of those and then balance it up on a lathe and makes a sanding disc out of it.
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9th December 2013, 02:52 PM #3GOLD MEMBER
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This method of grinding can cause premature wear of the chain due to ribbing across the bar face, A linisher does a better job as the sanding scratches run with the direction of the chain.
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9th December 2013, 03:18 PM #4.
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It's a good point but I haven't noticed premature chain wear compared to using a file to dress bars for many years.
If anything there has been less chain wear since I started using a metal cutting wheel to dress the bar, probably because this enables the bar to be more easily dressed than using a file so means it can be done on a more regular basis. Admittedly using a linisher would be better.
A further potential problem with scratches perpendicular to the bar is that they are more likely to be the starting point for a crack in the flame hardened edge of bar.
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9th December 2013, 06:28 PM #5GOLD MEMBER
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You are quite right, the use of a disc causes less "damage" to the bar, thus less wear, but dressing in the direction of the run gives even less wear. The other advantage with a linisher is there is minimal burring.
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10th December 2013, 06:26 AM #6
Don't have a linisher, also don't have a table saw, but Dad's is living here for a while
The sandpaper on this side of the disc is really fine, so the marks are very small, but I suppose to get them more longitudinal, versus mainly perpendicular, I could have raised the table until I was sanding at the 12 o'clock position as compared to the 3 o'clock position.
I have to admit I didn't look at the bar face yesterday while slabbing, dunno how long the sanding marks have stayed around...I love my Lucas!! ...just ask me!
Allan.
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11th December 2013, 11:18 PM #7
Lining up the bar after dressing it...
Once you have fitted your bar back into the carriage, lay a straight edge perpendicular to the bar and long enough so it reaches under each side of the carriage...
WP_001225.jpg
then measure to the underside of the carriage on the front and the back...
WP_001226.jpg WP_001228.jpg
In this instance for me the difference was close to 4mm from front to back, if this is left as is, the chain will be wanting to rise in the cut, potentially ruining a lot of nice slabs. So now the bar needs to be shimmed to bring it closer to level with the carriage, I use a soft drink can to make the shims...
WP_001230.jpg
Loosen off the bolt holding the bar into the frame, allowing space to slide the shim at the front or back (depending on where you need to push the bar down, for me in this instance it was at the front) between the bar and the flat washer...
WP_001233.jpg
Now tighten the bolt holding the bar into the frame and re-measure the distance to the carriage front and back...
WP_001236.jpg WP_001235.jpg
Head over to the other end of your bar and set up the straight edge the same way...
WP_001237.jpg
measure front and back again...
WP_001238.jpg WP_001239.jpg
again I use a soft drink can to shim between the bar and the frame to alter any difference, in this instance about 2mm, but this shim needs to be cut out to accommodate the 2 bolts holding the nose of the bar...
WP_001240.jpg WP_001242.jpg
re-tighten the bolts and check the measurements...
WP_001244.jpg WP_001243.jpg
slabbing bar is aligned properly againI love my Lucas!! ...just ask me!
Allan.
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