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bandsaw cirle cutting jig

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Forum topic by wuzfuzde posted 1096 days ago 729 views 0 times favorited 4 replies Add to Favorites Watch
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wuzfuzde

24 posts in 1282 days


1096 days ago

I am in the process of making a circle jig for the band saw——actually it is done…it ithe one that fastens to the base table and has a dovetail sliding piece that sets the diameter… in this sliding piece is a sharp pivot nail for the center of the intended circle to spin on …. My question and I understand it is a rather elementary question for this group….any way it would seem that it is very important for the center of the pin and the cutting edge of the blade to be in line’
If not the system goes out of control and it begins to spiral. I need to find a way line those two things up so my circles are well circles…
I took this plan from http://www.finewoodworking.com/Workshop/WorkshopArticle.aspx?id=30943

again i need to find a way to line up the center of the pin and the blade . Thank you for reading if you prefer you may want to send a reply to Wuzfuzde@gmail.com


4 replies so far

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woodsmithshop

1123 posts in 2177 days


#1 posted 1096 days ago

check out the last paragraph of the site that you got your plan from, it states,” the cutting edge of the teeth must align with the centerline of the pivot point on the sliding arm”

-- Smitty!!!

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fussy

980 posts in 1683 days


#2 posted 1096 days ago

Use a try square on the edge of the jig. Slide the jig forward until the square shows the leading edge of the blade and the center of the pivot point are aligned then clamp it down. The clamping block squares the jig to the table and allows you to slide the jig until you’re lined up. Hope it works. This is not a question too elementary for this forum. This is exactly why it’s here. Most of the time you get good information, and then someone like me comes along blowing smoke and you waste good wood listening to me. Seriously, that’s what it looks like to me. I’m planning to make this jig too, so let me know if I’m right.

Steve

-- Steve in KY. 44 years so far with my lovely bride. Think I'll keep her.

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Tootles

686 posts in 1134 days


#3 posted 1096 days ago

Otherwise you could try this …

1. Place the base board on your table with clamping block against the side edge of the table, as it should be, but pulled back towards you (i.e. the sliding arm is between you and the blade.
2. Push the sliding arm out past the position of the balde so that the pin is in line with the blade.
3. Push the base board forward until the sliding arm just touches the blade.
4. Measure the distance from the centre of the pin to the front of the balde.
5. Retract the sliding arm.
6. Slide the base forward by the distance that you have just measured from the centre of the pin to the bade
7. Clamp the base.
8. Mark a line under the base along the front and back of the table.
9. Install a stop under the base at both the back and front of the table such that the jig is automatically correctly positioned every time you use it.

If you try this and it works, please let us all know.

-- I may have lost my marbles, but I still have my love of woodworking

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wuzfuzde

24 posts in 1282 days


#4 posted 1095 days ago

Some progress has been made …not perfect but much better…. All thanks to you fellows imput.. My solution is re cutting my base board square… mounting the base board——use a square and from the rear lign the cutting edge of the blad with the center of the pin… apply a clamp on the side… gently push the pin rod into the running blade…. when it reaches the desired circe tighten the pin slider. and begin to cut and perhaps the most important lesson i learned was to——move ever so slightly the entire jig to the left or right… after the targeted circle is starting to operate correctly ..permantly tighten the side clamp/
Thank you for your suggestions Bill

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