| Project by BritBoxmaker | posted 837 days ago | 4247 views | 34 times favorited | 32 comments |  |
 |
This is version 2.0 of my Circle Cutting Jig for the band saw. Its a lot more rugged and accurate, including, as it does, a micro-adjust feature.
The overall size is 750mm x 400mm x 30mm. Materials are chipboard (laminated in three layers) and Beech with a length of M8 threaded rod, various metal and plastic bits. Circle cutting range is from 25mm radius to about 450mm radius. (I’m sure you can do the conversion into inches by now, there are 25.4mm to 1 inch)
This time the pin (with adjustable distance from the blade) is an M6 roofing screw. This is mounted in a sliding section of the table (bottom right of pic. 2) set in an M6 ‘T’ nut. This is detailed in the upper portion of pic. 5.
The sliding table section is held down due to its 15° bevelled sides.
The bottom portion of pic 5. shows the threaded rod which goes the entire length of the jig (This rod is imbedded in a slot between the middle and upper sheet of the chipboard). It threads into an M8 ‘T’ nut set into the left hand side of the sliding part of the table (pic. 6) and is captive at the extreme left hand edge of the jig, where the adjustment wheel is. The scale on the adjustment wheel is from a project by Russ (rmac) and is the only idea in this project that I’ve sourced from elsewhere. Thanks Russ. The adjustment wheel and its guide line are shown in pic. 4.
The M8 thread pitch is 1.25mm. There are 25 graduations around the adjustment wheel making the pin position accurate to 0.05mm. I know band saw blade run-out is greater than this but I will be using this jig for multiple, evenly spaced cuts, from the same workpiece and it is the cut spacing accuracy I am concerned with.
The jig is located into the bed of the bandsaw by a guide rail and clamped in position to the bed when in use.
I realise that all of the above may not be easily seen or grasped and so I may be blogging the build of this jig in the near future if there are many questions.
-- Martyn -- Boxologist, Pattern Juggler and Candyman of the visually challenging. http://www.theartofboxes.com
| Pin It |
32 comments so far
Andy
home | projects | blog
1336 posts in 2077 days
#1 posted 837 days ago
This is great! Thanks for sharing with all of us.
Andy
-- If I can do it, so can you. www.artboxesbyandy.com
BritBoxmaker
home | projects | blog
4008 posts in 1205 days
#2 posted 837 days ago
Thanks, Andy.
Well at least someone was able to understand my ramblings, above!
-- Martyn -- Boxologist, Pattern Juggler and Candyman of the visually challenging. http://www.theartofboxes.com
TheDane
home | projects | blog
2676 posts in 1832 days
#3 posted 837 days ago
Martyn—I like the threaded rod for fine adjustment … the one I made just has the center pin set in a sliding track that is secured (from the underside) with a plastic knob, which pretty much eliminates any micro-adjustment capability.
Thanks for posting this!
—Gerry
-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"
j_olsen
home | projects | blog
155 posts in 1340 days
#4 posted 837 days ago
i can see the use of andy’s clamp mechanism in this jig for quick positioning
very very nice build Martyn
thank you for posting and i for one will be looking forward to the blog
edit: gotta be ‘old timers settin in—i meant Steve’s (SPalm) clamp mechanism—sorry Andy and Steve—gets tough distinguishing all the masters!!
-- Jeff - Bell Buckle, TN
steliart
home | projects | blog
1286 posts in 857 days
#5 posted 837 days ago
Martyn
very well made and very nice fine adjustment system.
Thank you
-- I am not so rich to buy cheap tools.
tyka
home | projects | blog
139 posts in 862 days
#6 posted 837 days ago
Very smart design and very well done jig. It’s in my favorites for later. Thanks for sharing.
-- Paul, Plantagenet, Ontario
SPalm
home | projects | blog
4108 posts in 2051 days
#7 posted 837 days ago
Seems straight forward enough to me. Nice. You always build such nice looking jigs.
Now, what you going to do with it?
Steve
-- -- I'm no rocket surgeon
Dez
home | projects | blog
1097 posts in 2246 days
#8 posted 837 days ago
Fancy!
-- Folly ever comes cloaked in opportunity!
SASmith
home | projects | blog
1368 posts in 1156 days
#9 posted 837 days ago
Great jig. I may have to try this on my scrollsaw.
I would like to see the blog if you get one put together.
Thanks for the post.
-- Scott Smith, Southern Illinois
BritBoxmaker
home | projects | blog
4008 posts in 1205 days
#10 posted 837 days ago
Jeff. For coarse adjustment I just clamp the piece of rod, on the left hand side, in a power drill and squeeze the trigger. Within a minute I can go from one end of the scale to the other.
-- Martyn -- Boxologist, Pattern Juggler and Candyman of the visually challenging. http://www.theartofboxes.com
davidroberts
home | projects | blog
952 posts in 1655 days
#11 posted 837 days ago
Brit – very smart. Send that to Wood magazine or similar woodworking mag and get a free tool or two. Really. No, really.
-- david roberts, spinning Tales from Topographic Oceans, no, really.
BritBoxmaker
home | projects | blog
4008 posts in 1205 days
#12 posted 837 days ago
Oh thanks, David. Never thought of that.
-- Martyn -- Boxologist, Pattern Juggler and Candyman of the visually challenging. http://www.theartofboxes.com
Diggerjacks
home | projects | blog
1311 posts in 1308 days
#13 posted 837 days ago
Hello Martyn
Another very good jig
Do you have another version for the future ? A beautiful work I like the micro-ajust
Have you done some project with this jig?
Thanks a lot for sharing.
This jig give me some ideas
-- Diggerjack-France ---The only limit is the limit of the mind and the mind have no limit
BritBoxmaker
home | projects | blog
4008 posts in 1205 days
#14 posted 837 days ago
Keep an eye out, Diggerjacks. When I recover from making the jig I’ve an idea or two I want to try with it.
-- Martyn -- Boxologist, Pattern Juggler and Candyman of the visually challenging. http://www.theartofboxes.com
Diggerjacks
home | projects | blog
1311 posts in 1308 days
#15 posted 837 days ago
I’m sure you have done this jig for one or two projects and you have another for the future
We can’t make a jig just for the pleasure !!!!!
We make a jig for a project and we have a lot of pleasure to make it
My eyes are open
Have a nice day
-- Diggerjack-France ---The only limit is the limit of the mind and the mind have no limit
View all comments »
showing 1 through 15 of 32 comments
Have your say...