choochoorocks
starting to spend too much on rocks
Rock hounding
Member since April 2020
Posts: 181
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Post by choochoorocks on Dec 3, 2023 12:05:10 GMT -5
Hi,
I'm mechanically challenged so this may be a stupid question. I have a Lortone 12" slab saw that I bought used some years ago. One of the bolts on the carriage has always been weird: when tightening the nut down on a rock, once there is some resistance, the whole bolt will turn with the nut. It kinda still does the job, but the bolt will sometimes end up protruding too far beneath the carriage and will block lateral motion.
I tried looking at the other bolt to see what makes it stay fixed, but can't see anything different about it. How can I fix this?
Oh and the problematic bolt now has some smooshed threads and the nut gets blocked fairly high up and I figure it's time to change the bolt.
Thanks in advance for any advice!
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Post by Rockoonz on Dec 3, 2023 12:41:32 GMT -5
Here is the manual for the saw with parts drawing on page 4. lortone.com/cdn/shop/t/4/assets/LS12C_Parts_List.pdf?The clamp bar bolts are just regular all thread rod you can get at a hardware store, and it looks like you could add a thin jam nut on top to keep the new one from turning. I built an upgrade bar for my similar 10" saw for improving the clamp down on those style saw vices. |
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Post by Rockoonz on Dec 3, 2023 12:48:40 GMT -5
Here is the upgrade bar, I used heavier angle than anyone would need, but the outrigger on the back is the real mod, it keeps the clamping parallel so a rock can be clamped pretty much all the way out in the vice like a slab grabber without the bar tipping and spitting the rock out.  |
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choochoorocks
starting to spend too much on rocks
Rock hounding
Member since April 2020
Posts: 181
|
Post by choochoorocks on Dec 7, 2023 10:41:24 GMT -5
Here is the manual for the saw with parts drawing on page 4. lortone.com/cdn/shop/t/4/assets/LS12C_Parts_List.pdf?The clamp bar bolts are just regular all thread rod you can get at a hardware store, and it looks like you could add a thin jam nut on top to keep the new one from turning. I built an upgrade bar for my similar 10" saw for improving the clamp down on those style saw vices. Thanks for your advice on this. Will any regular nut work as a jam nut? |
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Post by pauls on Dec 7, 2023 18:13:57 GMT -5
An ordinary nut will do just fine, as long as you get the correct thread type.
You could also try taking the threaded bit out cleaning everything up and applying some locktite thread sealer. For locktite to work surfaces have to be clean, really clean, you would probably need to clean first with some kerosine or petrol, or white spirit and then a final clean with some acetone.
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Post by Rockoonz on Dec 8, 2023 0:00:42 GMT -5
choochoorocks any nut that fits is fine, but if space is limited a hardware store like Ace will have thin ones.
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Post by victor1941 on Dec 9, 2023 10:30:37 GMT -5
Take the nut with you to the store when buying a replacement.
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choochoorocks
starting to spend too much on rocks
Rock hounding
Member since April 2020
Posts: 181
|
Post by choochoorocks on Dec 16, 2023 19:22:53 GMT -5
Turns out the winged nut was blocked because it was slightly off -- maybe bought metric by mistake. Its threads were stripped by the rod, which is a harder metal.
For now I've replaced it with a nut, and that worked for the first cut in long time today.
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Maybe you can post some pictures here