LumberJocks

How much is a bump on a TS fence?

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Project by woodbutcherbynight posted 01-24-2016 10:21 PM 2085 views 2 times favorited 26 comments Add to Favorites Watch

How much is a bump? For everyone this will be different. One thing is common, you don’t really know exactly how much so when you bump your fence it is a guess. Most times we have enough experience that this seems trivial. But when you need it to be exact how would you measure such a small distance? I wear a brace for my wrist so a bump with my brace on is greater than without. Who knew?

Borrowing from another woodworker I decided I had enough of guessing, and being wrong when I needed it the most. Digging through my toolbox I found a dial indicator that judging by the dust on the box had not been used in a long time. Cutting off part of the bracket I then made the wooden blank from some scrap and grabbed a magnet from my collection. Having used it for the past month I am impressed, it works as I saw in a video and you could be accurate down to the 10,000 ths if you wanted. Probably more than I will ever need but when cutting in a dado to odd width wood this has proven excellent in making a tight fit. The nice thing about this design is it can be used on the table saw, the bandsaw or just about any metal surface you wish to set up a cut. I even used it to measure run-out on a band saw blade I thought, and using this, proved had a bad weld.

While I used what I had in the shop this can be made for less than $20. Looking online I found dial indicators for $10, higher for better grade ones, and a fairly decent magnet can be found at most hardware stores for less than $5. Improvement in accuracy when you need it the most = priceless.

Enjoy and be inspired.

-- Live to tell the stories, they sound better that way.





26 comments so far

View TheFridge's profile

TheFridge

5765 posts in 947 days


#1 posted 01-24-2016 10:32 PM

Yeah buddy. My starrett indicator had a screw post I can screw a donut magnet on to. I keep it on my fence. Works like a champ.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View MadMark's profile

MadMark

977 posts in 914 days


#2 posted 01-24-2016 10:47 PM

This is why I own Incra LS-III – accuracy to 1/32” repeatability +-.005” EVERY TIME – no bumping, ever!

M

-- Madmark - Madmark2150@yahoo.com Wiretreefarm.com

View TheFridge's profile

TheFridge

5765 posts in 947 days


#3 posted 01-24-2016 11:03 PM

That’s nice. But there’s quite a few hundreds of dollars difference between the 2.

What would you do if you needed to cut a piece .763?

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View pottz's profile

pottz

900 posts in 446 days


#4 posted 01-24-2016 11:56 PM

cmon guys were not making precision parts for the space station, hundreths of an inch,do we really need that much precision in wood working?if you need a tolenence that close you could literaly sand it off!

-- sawdust the bigger the pile the bigger my smile-larry,so cal.

View gimmo's profile

gimmo

39 posts in 1344 days


#5 posted 01-25-2016 12:33 AM

the red and black dial next to the red pointer that you see in the bottom pic of the incra system is the micro adjustment. it takes 16 clicks to move it 1/64” which equals .0009765” with each click. The incra system is ideal for accuracy. It is much easier to turn the dial a few clicks than to use a dial indicator to get the exact measurement you want. The incra rules are also a good investment. They have a hole or line every 1/64” that a 5mm pencil fits in perfectly so when you make a mark it is right on. You do pay dearly for this accuracy tho, they are not cheap but if you like perfection they are worth every penny. Move it down to the end past the table saw to the router and use it for the router to get your perfection ther also.

-- Stan, Southville, Ky

View MT_Stringer's profile

MT_Stringer

2851 posts in 2692 days


#6 posted 01-25-2016 12:35 AM

For me a bump=a smidgeon. :-)

-- Handcrafted by Mike Henderson - Channelview, Texas

View TheFridge's profile

TheFridge

5765 posts in 947 days


#7 posted 01-25-2016 12:46 AM

.005 is the difference between a loose and a tight joint (see woodgears.ca) not to mention you can feel it and see it and it does matter. While I appreciate the incra very much, have an 1000hd miter gauge, I don’t need to spend 900$ to achieve the same precision. I’m plenty fine with spending less than an extra minute to get the same result. Honestly, I’d rather spend that money on some lie Nielsen tools.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View CharlesA's profile

CharlesA

3020 posts in 1259 days


#8 posted 01-25-2016 01:14 AM

I have a very finely honed bump that moves my fence 1/1000 of an inch. Precision. The only pain is that it takes me 500 bumps to move the fence 1/2”.

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson

View TheFridge's profile

TheFridge

5765 posts in 947 days


#9 posted 01-25-2016 01:18 AM

:) this guy ^

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View indianajoe's profile

indianajoe

55 posts in 1444 days


#10 posted 01-25-2016 02:20 AM

as a former machinist I love to be as precise as possible. I know wood moves with humidity and temperature change but I find that the more precise the better the final product. I get made fun of all the time for using my machinist tools in the wood shop but its in my blood now after working in a machine shop. Even if its not terribly critical I know and that’s what matters to me.

View gimmo's profile

gimmo

39 posts in 1344 days


#11 posted 01-25-2016 02:34 AM

If we all had the mindset of IndianaJoe then we would all be producing some better projects.

-- Stan, Southville, Ky

View woodbutcherbynight's profile

woodbutcherbynight

2420 posts in 1870 days


#12 posted 01-25-2016 02:42 AM

Some good points made, pro and con. Thanks for the comments and feedback. I agree the Incra is a valuable investment. But my budget says otherwise, so in the mean time this will work and has several applications it can be used for.

+1 MT_Stringer I enjoyed the bump = smidgeon.

indianajoe Yes I get same comments and some about why does it take so long. Apparently 3 coats of poly dries in 10 minutes. LOL

pottz When making runners for a table saw sled, yes the lack of precision could mean the difference between the sled being square first time out, or having to do it again.

-- Live to tell the stories, they sound better that way.

View hoss12992's profile

hoss12992

3831 posts in 1354 days


#13 posted 01-25-2016 04:30 AM

That is really cool and a great idea. To answer your question about how much a bump is, for me it depends a lot on my mood. Most of the time it’s just a smidgen but if I’m not a happy camper it usually = ALOT MORE THAN A SMIDGEN. Great job buddy

-- The Old Rednek Workshop https://www.facebook.com/theoldrednekworkshoptn

View woodbutcherbynight's profile

woodbutcherbynight

2420 posts in 1870 days


#14 posted 01-25-2016 04:55 AM



That is really cool and a great idea. To answer your question about how much a bump is, for me it depends a lot on my mood. Most of the time it s just a smidgen but if I m not a happy camper it usually = ALOT MORE THAN A SMIDGEN. Great job buddy

- hoss12992

Same for me, it depended on how bad my wrist hurt. LOL

-- Live to tell the stories, they sound better that way.

View MadMark's profile

MadMark

977 posts in 914 days


#15 posted 01-25-2016 05:05 AM

Incra LS-III precision fence is $400, not $900.

Precision and repeatability:
Low end cab saw (Griz 715P): $850
Incra LS-III precision fence: $400
Incra Miter1000 miter gauge: $125
Digital height gauge: $40

Under $1500 and you can out cut most anything with no ginching – ever!

M

-- Madmark - Madmark2150@yahoo.com Wiretreefarm.com

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