Internal Grooving

[Terry Vanpool]

I need to cut an internal groove in a .177 bore for a 1.5mm wide oring. The groove needs to be approx. .100" inside the bore. Is there a ready made grooving tool you could recommend or should I just grind something from HSS? If it is affordable <$50 I would buy it if not I will try to grind something.

 

[mattthemuppet2]

I'm not very good with inches, but 0.177in sounds like an awfully small bore. It'll be a challenge to grind a cutter that will be thin enough to fit in and not flex under cutting loads. 0.1in deep isn't that bad, but still. Sounds like this would be a good fit for a Micro100 carbide bar - you see them a bunch on eBay for not too much money. no idea if they offer one that would work for that size though.

 

[Tony Wells]

If the material isn't hard, or difficult to machine, HSS will be the economical way to go. If you have several to do, or the material is tough, you might consider a carbide tool.

http://www.thinbit.com/products/grooving/mi_grooving.html

Once you know what you are looking for, the bay might be your friend. Otherwise, you can buy new.

 

[mmcmdl]

.060 wide groove in a .177 bore ? I wouldn't attempt that on one shot . Maybe a .015 tool and step it then finish . I would think you'de be chattering just a bit .

Edit . You are only 1/8" in the bore ? Shouldn't be a problem then . Go with a stub bar .

 

[Jimsehr]

What is the dia of the groove size. I think you may have to grind the tool about .03 wide and plunge to dia of groove then bore to the .06 size width .
jimsehr

 

[dlane]

Are you working on a pellet gun ? , just curious

 

[mmcmdl]

If you go on the Bay , this is what you would be looking for . Micro 100 with carbide bars . I will lend them to you if interested if you return them in as new condition as they are .

 

[Terry Vanpool]

Yes this is a pellet gun. The barrel is made from (LW19, a chrome-molybdenum type steel). I am not sure what LW19 is exactly but it is a fairly soft steel. The "O" ring is 1.5mmx4.5mm so the groove will need to be about .060 wide and .050" deep.

 

[Tony Wells]

Not trying to second guess your project, but is it possible to groove the OD of the mating part instead? Usually easier, even if you have to bore out a bit on the ID.

 

[Terry Vanpool]

Unfortunately the mating part cannot be grooved and function properly. It might be possible to make a cap to go on the end of the barrel that will provide the oring groove but working with something this small will tax my abilities and equipment.