LumberJocks

Zero Clearance Insert

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by DKV posted 02-23-2013 10:42 PM 1290 views 1 time favorited 31 replies Add to Favorites Watch
View DKV's profile

DKV

3194 posts in 1252 days


02-23-2013 10:42 PM

I don’t use any kind of dust collection above the saw blade and have found that I get less dust in the face when I use the standard kerf insert that came with my tablesaw versus when I’m using my zero clearance insert. I might be imagining it. I now only use my zero clearance insert when I am cutting thin strips.

I have also found that if I leave the gullet of the blade slightly below the surface of the wood I also get less dust in the face. Of course it may all be in my imagination. My saw is not used for production so any heat build up with the blade lowered is not a problem for me.

What are your thoughts? Has anyone found the same?

-- Have fun and laugh alot. Life can end at any moment. You old guys out there know what I mean...


31 replies so far

View Nicky's profile

Nicky

636 posts in 2839 days


#1 posted 02-23-2013 11:12 PM

I don’t use any dust collection above the blade either. I have my zci on most of the time and do get dust. I made some bevel cuts today with the standard insert and did not notice any difference. I adjust the height of my blade so that it’s about 1/4” above the stock being cut, so the gullets are below the surface of the stock.

I’ve learned the hard way to always wear my safety glasses and live with the dust.

-- Nicky

View Tennessee's profile

Tennessee

1556 posts in 1262 days


#2 posted 02-23-2013 11:18 PM

I agree with DKV. Since I got my zero clearance inserts for my Rigid4512, I have way more chips flying ABOVE the blade than before, so much that for general cutting, I put back on the insert that came with the saw. I now use the zero for small boards, since it is much safer than losing a piece down below.

-- Paul, Tennessee, http://www.tsunamiguitars.com

View DKV's profile

DKV

3194 posts in 1252 days


#3 posted 02-23-2013 11:24 PM

Thanks Tennessee, after Nicky’s post I was beginning to think it was all in my imagination.

-- Have fun and laugh alot. Life can end at any moment. You old guys out there know what I mean...

View JesseTutt's profile

JesseTutt

811 posts in 858 days


#4 posted 02-23-2013 11:41 PM

I have the same experience with zci and more chips.

-- Jesse, Saint Louis, Missouri

View joeyinsouthaustin's profile

joeyinsouthaustin

1286 posts in 820 days


#5 posted 02-24-2013 04:41 AM

I drilled a 1” hole in my zero clearance insert just behind the teeth on the side away from the fence, at the front. The teeth still cut through for reduced blow out, and the fence side is still good for thin rips, but the extra air flow pulls down about %50 more than without it, and more than the standard insert. It is an airflow thing, I will post pics in the am. (texas time)

-- Who is John Galt?

View DKV's profile

DKV

3194 posts in 1252 days


#6 posted 02-24-2013 04:47 AM

Joey, I wonder if the insert was peppered with 1/4” holes that would work?

-- Have fun and laugh alot. Life can end at any moment. You old guys out there know what I mean...

View joeyinsouthaustin's profile

joeyinsouthaustin

1286 posts in 820 days


#7 posted 02-24-2013 04:59 AM

What I found is the larger chips and dust follow the blade right around almost to the front of the blade. You will notice they don’t go straight up, they come straight at you, or pile up on the table by the front of the blade. I experimented a bit before I came up with this. That particular location actually catches them right where they get “knocked” off the blade, or as they are flinging off. Also on material where you have just a smaller amount of material off the non fence side, it catches quite a bit of the dust. This is on modern uni saw with 1.5 hp dust collection. So the saw cabinet is fairly well sealed. A hole at the back of the blade did not work as well, And, as you have seen, the standard insert allows material to fall in occasionally. I would be interested in the swiss cheese experiment, but i think it won’t catch as much of the larger chips. I may even do a video of it at work.. That said, it does not do as much as overhead, but compromises between the best of the zero clearance, and what folks have noticed with the wider factory insert.

-- Who is John Galt?

View DKV's profile

DKV

3194 posts in 1252 days


#8 posted 02-24-2013 04:59 AM

After some more reading I think keeping the gullets low in the wood helps to decrease above table dust.

-- Have fun and laugh alot. Life can end at any moment. You old guys out there know what I mean...

View joeyinsouthaustin's profile

joeyinsouthaustin

1286 posts in 820 days


#9 posted 02-24-2013 05:04 AM

Yes, but this height varies blade to blade. Your manufacturer will give a recommendation. and I have always been taught at least gullets fully visible for cooling. some encourage up to 3/8” above. I am glad to see this has annoyed others… It annoyed me enough to try a solution. Pics will help so I will follow up with a post.

-- Who is John Galt?

View shelly_b's profile

shelly_b

848 posts in 865 days


#10 posted 02-24-2013 06:25 PM

I haven’t used my standard insert for so long I’m not sure. I also don’t have above the table collection. If I am only taking off <1 />t know how to help lol. But your not alone! I would like to try the swiss cheese idea though…or maybe add a kerf(slit) or 2 on the sides of the blade…

View 404 - Not Found's profile

404 - Not Found

2544 posts in 1717 days


#11 posted 02-24-2013 07:48 PM

I was a little intrigued by this, and offer some observations I made today cutting slips for glazing doors.

Blade low, less dust, cleaner cut.

Blade high, more dust, cut as rough as a badger’s backside.

View DKV's profile

DKV

3194 posts in 1252 days


#12 posted 02-24-2013 08:28 PM

renners, thanks for the test. I’m going to play around with it some more today.

-- Have fun and laugh alot. Life can end at any moment. You old guys out there know what I mean...

View RVroman's profile

RVroman

163 posts in 771 days


#13 posted 02-24-2013 08:38 PM

I have had the same experience with the ZCI and dust. Because of that I built an above blade guard/vacuum port that I saw in one of the magazines (I cannot remember which one). Interesting comments about the gullets. I had always heard they needed to be just above the wood for both safety and cooling. Cooling issues aside are there any safety issues with having just the teeth through the wood? The cleaner cut aspect is as beneficial as the dust issue.

-- Robert --- making toothpicks one 3x3x12 blank at a time!

View DKV's profile

DKV

3194 posts in 1252 days


#14 posted 02-24-2013 09:24 PM

A.

B.

C.

Here are the results from today’s test. A pic with the blade well above the gullet had the least smooth cut and the most dust. B pic with the gullet just below the surface of the wood had about the same smoothness of cut and less dust. C pic with only the tops of the teeth above the wood had the smoothest cut and almost zero dust.

All tests were done with my dust collection on and as shown in the last picture a series of holes drilled in the ZCI. I think I am where I should be. I could drill some more holes but I’m happy with test C. Unless someone can tell me why I might be risking my life by keeping the teeth so low I will continue to cut this way.

-- Have fun and laugh alot. Life can end at any moment. You old guys out there know what I mean...

View 404 - Not Found's profile

404 - Not Found

2544 posts in 1717 days


#15 posted 02-24-2013 10:05 PM

DKV, I feel you have reached a milestone. No mention of Jesus, Allah, Obama etc. Well done.

showing 1 through 15 of 31 replies

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com

Latest Projects | Latest Blog Entries | Latest Forum Topics

GardenTenders.com :: gardening showcase