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Peter, it is a Precharged Pneumatic (PCP) air rifle. This one is a .308 caliber. Look up Airforce Texan (Not the plane). The tank holds 3000psi high pressure air.

This one is complete.

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The control key is your best friend when making assembly joints. It does take some retraining the ole brain when it comes to their new assembly method.

Another project underway on the new machine.

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The guy is what I would call a pony rider. He will tell you 250 different ways to ride a pony, but he doesn't own one. Run it's a trap.

That is indicator the the plastic is melting. Maybe a combination of lowering rpm and increasing feed rate. I would lower rpm first.

Machined some Delrin today.

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Hi Peter, Thanks! I am modeling in Fusion and using it for CAM too. I am using solids to model. I have just not had the time to develop any skill at the B-spline surface modeling. It does look...

Do you have any plastic building up on the cutter before it breaks or any on the cutter shank? I lean towards the low end on RPM and the high end on feed per tooth to try and keep things cool.

What speed and feed rate are you using?

I like Jim's idea for roughing it with the drill to get the bulk of the material removed

Stock #1 of the new machine is done.

Simple lines in walnut and iron.

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First coat of oil on the first stock cut on the new machine.

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Inlet and blocks installed.


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Peter good deal on the stock to leave function working for the inlay work.

It is kind of never ending.

Cut some aluminum for bedding blocks to install in the stock. Next will be inletting the stock for the blocks to fit. Then epoxy them in place and machine the...

I would use the "stock to leave" in the passes tab for most of the tool paths and you can use negative or positive numbers depending on it you want to under cut or over cut.

That is mine method...

I found the Fusion 360 assembly method very different from other software and still trying to really get proficient with it. Just the growing pain of learning new software.

Peter I am really happy with the machine. It is performing up to my expectations for the build. My next chore is the figure out how to set up a tool length setter to help automate manual tool...

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Excellent

Here is just a little bit of the roughing operation.

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Looking good

Peter, In F360 you can create sketch geometry to control CAM tool paths. For example the first image I have a sketch on the left half of the part profile and selected in in a 2D contour tool path. ...

I started cutting the full length stock in pine. Using a 1/2" 4 flute roughing end mill for the roughing tool paths on the sides. Major step down DOC .375" RDOC .125" 360 IPM feed rate.
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I think I have my CAD model fine tuned to fit the action. Fresh of the machine. Fitting like a glove.

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Check the Z motor to Z ball screw coupler for being tight. Try slowing the Z axis accelerations if the coupler is tight.

Cutting a prototype section of a stock to test fit the inletting to the action before cutting the full stock. The wood was just some SPF plywood I had glued up from scrap.

I used some 25mm x 70mm(Inner H x Inner W) for my X and Y. Plenty big, but not overly large. For the Z I used 18mm x 50mm with only the spindle cable in it. It could have been smaller but I...

First cuts on the rotary axis.

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Peter looking good on the skateboard mold. Is this a prototype being made from MDF or plans to harden it it some way? How are you liking the new spindle?