Can I get some help understanding how to take precise measurements please

[FLY-FAST]

Hi All.

I am hoping that I can get some advice regarding a measuring conundrum I am facing.  I have taken on a woodworking project that requires precise measuring.  For example, the measurements that I need to cut is 6 & 7/64 " and 5 & 9/16" and 6 & 57/64'th".

I have standard tools including a 6" micrometer. 

Can anyone give me a push in the right direction here?  

[prov163]

Cut just a little bit long then trim to exact measurement on a shooting board. I can't imagine a better way to get the result you're looking for, but some of the other guys may have another technique. 

[Pwalter5110]

I agree that your only real hope of ensuring that kind of accuracy is with a shooting board. But I have to ask what you're making that requires that kind of accuracy. I honestly feel that the wood will move with humidy changes throughout the year and you will shrink/grow more than 1/64"

[davewyo]

25 minutes ago, FLY-FAST said:

Can anyone give me a push in the right direction here?  

Try flying slower?

Jess kiddin'. I have nothing constructive to say beyond what has been posted, I'm just being a wise ass.

[krtwood]

Crosscut sled and make test cuts.  I added a fine adjustment screw to the stop on my crosscut sled.  Easy to dial it in without overshooting trying to actually move the stop around.  Another way is to add/subtract shims between the stock and the stop.

[mat60]

My sliding table on the table saw had a adjustable stop as does the chop saw. Works for me but I think you have the idea now...Oh..Im 56 and I cant even see 57/64.

[FLY-FAST]

Thank you all.  I am building a desktop CNC. 

It's on instructables:

http://www.instructables.com/id/DIY-CNC-Machine-36x22/

[bleedinblue]

So my suggestion of a CNC wouldn't be much help then?

But seriously...57/64th? 

[Brendon_t]

What medium are you cutting?  anything I know of other than mdf is going to move enough to make your cuts plus or minus. even plywood will move 64ths..

[FLY-FAST]

The medium I am using i's 3/4" mdf.

[Immortan D]

Yeah, metric to imperial madness, 6 57/64" is 175 mm. Get a metric ruler and the metric version of the plans.

[Pwk5017]

Gonna need a 0.3mm mechanical pencil and some good eyes. You need those magnifying glasses you can flip down. With all those measurements, i would prefer to "sneak up" on the cut. Human error with marking the line accurately off a rule/tape can lead to missing the dimension 40-50% of the time. and by "missing", i mean by 1/64". 1/64th is pretty much the width of a 0.5mm mechanical pencil line, which side of the marked line do you cut on? See where i am going? Better to cut it 1/32 long and this breathe on it until it fits perfectly. 

[RichardA]

15 hours ago, mat60 said:

My sliding table on the table saw had a adjustable stop as does the chop saw. Works for me but I think you have the idea now...Oh..Im 56 and I cant even see 57/64.

I'm 73 and way past 64ths.

[wdwerker]

At that level of accuracy I use a magnifying headband and mark with a marking knife or an Xacto . Then you can color the cut with a thin mechanical pencil and you can sneak up on the cut. If you don't have a combonation square with 64ths on it look at .

http://www.harryepstein.com/index.php/12-2-pc-combination-square-metric-usa.html

[Tom Cancelleri]

You might wanna beef up those Y plates on the gantry. Just 3/4 MDF isn't gonna be rigid enough to provide you with any sort of accuracy. Honestly you're better off getting metal plates and some extrusions to build it.

[mummak]

When I want a more precise cut I mark with a knife rather than a pencil and use the same measuring device throughout the project. I would try a steel rule for less than foot lengths.

Your dilemma reminded me of the old machinist maxim, measure with a micrometer, mark with soapstone and cut with an axe.

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