Bogged in Biggs Jasper

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JR8675309
freely admits to licking rocks

Member since August 2019
Posts: 807

Bogged in Biggs Jasper Jun 1, 2021 8:11:16 GMT -5 via mobile

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Post by JR8675309 on Jun 1, 2021 8:11:16 GMT -5

Good morning. I am looking for insight into my saw and/or blade after mall view the saw marks in two slabs I cut. After all it's nice material and I don't want to be wasting it by millimeters. If you know how to get the saw marks out that would be useful to. Also let me know if this thread should live in the equipment section please.

The details and circumstances: I have an 8" drop (chop) saw from the 60's and I acquired it late 2019. It's manually cooled with mineral oil; as in, I hold the tubing coming from pump on the blade directly. I replaced the blade recently with a new MK-303 and this is the second cut with it and a new motor. With high hopes I cut this Biggs Jasper 2" x 4". It was slow going and the saw bogged down at one point when it was fully into the cut (1/2 way-ish). The material was HOT when done.

Are the marks being made when the saw gets bogged down? Could I be introducing them by the way I lubricate the blade? Perhaps the pressure moves the blade some? I can change the lube method back distributing from a fixed location... the reason I do this manually is the old motor was having issues pushing the oil that high on the machine.

I appreciate the input.
res.cloudinary.com/jr8675309/image/upload/v1622551336/Biggs%20Jasper%20wet%206-2021.jpg

res.cloudinary.com/jr8675309/image/upload/v1622551338/Biggs%20Jasper%20blade%20marks%206_2021.jpg

res.cloudinary.com/jr8675309/image/upload/v1622551608/Biggs%20Jasperblade%20marks%20w%20Sugarbowl%206_2021.jpg

Oooh shiny...

jasoninsd
can identify rocks - even green ones

I Wish I Knew Half The Stuff I Thought I Knew 30 Years Ago!

Member since July 2020
Posts: 18,436

Bogged in Biggs Jasper Jun 1, 2021 13:18:34 GMT -5

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Post by jasoninsd on Jun 1, 2021 13:18:34 GMT -5

I have a 10" wet tile saw that I use to slab. I encountered the same thing with a brand new MK-303 blade when I cut softer material to start. Once I cut some harder material, the saw marks went away. I think (in my case) the new blade just needed to be "dressed"...

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JR8675309
freely admits to licking rocks

Member since August 2019
Posts: 807

Bogged in Biggs Jasper Jun 1, 2021 13:31:53 GMT -5 via mobile jasoninsd likes this

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Post by JR8675309 on Jun 1, 2021 13:31:53 GMT -5

Jun 1, 2021 13:18:34 GMT -5 jasoninsd said:

Oh! One can only hope it just needs to be dressed!

Oooh shiny...

stefan
Cave Dweller

Member since January 2005
Posts: 14,113

Bogged in Biggs Jasper Jun 1, 2021 16:19:27 GMT -5 JR8675309 and jasoninsd like this

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Post by stefan on Jun 1, 2021 16:19:27 GMT -5

Could be any number of problems: the blade needs to be dressed, or the rock is vibrating in the vise, the alignment is off, blade is slightly dished. What worries me is the rock being hot after cutting. That should not be happening. Warm is ok but hot is not good. You need better oil flow to keep things cool (or a slower feed rate). Perhaps a slower feed will help with the marks

I can't tell if thats some Gneiss Schist, or that Schist is Gneiss. All I know is don't take it for Granite

JR8675309
freely admits to licking rocks

Member since August 2019
Posts: 807

Bogged in Biggs Jasper Jun 1, 2021 20:26:47 GMT -5 via mobile jasoninsd likes this

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Post by JR8675309 on Jun 1, 2021 20:26:47 GMT -5

You are right! I forgot that the vice was vibrating and the wing nuts started unscrewing. I have never had that happen (and forgot all about it). Still that doesn't explain the first cut. Maybe I'm going to fast/pressing too hard.

Oooh shiny...

Peruano driving up their electric bill Heads Up! Member since March 2011 Posts: 2,429	Bogged in Biggs Jasper Jun 1, 2021 20:33:15 GMT -5 jasoninsd likes this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Peruano on Jun 1, 2021 20:33:15 GMT -5 Yes
	Tom Combining bicycles, trailbikes, hiking, and rockhounding as a justification for enjoying the fresh air of New Mexico.

catmandewe gets rocks for Christmas Contact me for a discount on DP Products. Member since April 2007 Posts: 5,462	Bogged in Biggs Jasper Jun 1, 2021 22:57:40 GMT -5 JR8675309 likes this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by catmandewe on Jun 1, 2021 22:57:40 GMT -5 You did a great job with a hand fed 8" saw and loose clamps, slow it down and make sure the clamp is super tight, 8" is not really designed to be a slab saw. Tony
	Join the adopt a rock program. Tis a sad thing to see a rock without a good home. Dealer for CabPro8 Authorized Diamond Pacific Dealer CabKing affiliate cabking.myshopify.com?aff=5

JR8675309
freely admits to licking rocks

Member since August 2019
Posts: 807

Bogged in Biggs Jasper Jun 2, 2021 7:46:37 GMT -5 via mobile jasoninsd likes this

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Post by JR8675309 on Jun 2, 2021 7:46:37 GMT -5

Jun 1, 2021 22:57:40 GMT -5 catmandewe said:

You did a great job with a hand fed 8" saw and loose clamps, slow it down and make sure the clamp is super tight, 8" is not really designed to be a slab saw.

Tony

Thanks for the advice! Yes I keep trying to tell the spouse that I need a bigger saw

Oooh shiny...

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