Gallery, Projects and General > How do I??

Drill holes in a bolt circle

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Darren:
Print that autoscetch and fold the paper, nah, can't be that....can only get about 4 or 5 folds..... :lol: :lol:

bogstandard:
There is a bolt circle calculator in the little workshop proggy that I put in the downloads section, but it only goes up to 12.

Maybe you could download this one and try it out.

http://iwr.ru.ac.za/~iwdf/lathe/pcd.html


Bogs

sbwhart:
If you're mills got a DRO that'l do it with co-ordinates, if not you can work the co-ordinates out, or consult a text book that with tables to work out co-ordinates.   

I feal a banna dance comming on

 :ddb:  :ddb:   :ddb:    :ddb: 

Cheers
 :wave:
Stew

SPiN Racing:
IIRC for the times I have had to draw up a bolt circle...    hoo.. been a while.. and my geometry is one of those things that sits in a closet of my brain.. And I can apply it to a specific project..


If it were me.. I would take a sheet of paper. I would then draw a circle with a compasssss. (this is pre-CoC for those who are not familiar.. this charcoal in wood device.)
Im assuming drawing it in Auto cad is out as well.

SO I would then find the center of the circle. Then I would Bisect the circle and mark the diameter of the bolt circle.

Scribe a circle at the new dimension.

THen figure on paper how many degrees of seperation angle between each bolt.  Say its 4 Bolts.. then its 90 per bolt.

Simple Bisect it, then with the compass, mark your 90 degree angle and scribe the line.

Mark the hole at each intersection of the bolt circle diameter.

If you have more intersections, you will need to figure how many degrees of seperation you have and start to bisect the angles... aka the 90 divides to 45s. THen those to 22.5. Etc.
Then select the combination of angles to mark off your number of bolt holes.

Once you have the exact number of bolt holes, I would erase the other crapola leaving the exact pattern.
Cut a opening in the paper to fit it around the part.. then overlay it, and with a punch center punch each bolt hole.

The alternative is to dykem the face of the part, and repeat the above procedures.


Thats about how I would pull it off LOL.

Right?  Not sure. But it would likely work.

Bernd:
As I stated in my thread on the index head, this might not work for this particular project.

I'll have details in the next few days because I think it's something of interest if you have no other means of dividing a round part for indexed hole drilling. (Does that even make sense?) :scratch:

Bernd

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