deburring inside drilled tubing? (2023 Update)

Thanks Joe... a lot to think about from all the great responses.

Wayne

immediately

Cost!!!!

My client is now in contact with Cogsdill sales engineers and the project may go in that direction. So far it promises the best in initial cost and actual operations... will see.

Wayne

What about step drilling the hole ? Drill the hole to a smaller size then drill to size. One drill ( step drill ) I have done it many times . It leaves less or even no burr .( definitely no hanging burr )

Can you pump abrasive slurry through it?

Shawn Olsen snipped-for-privacy@gmail.com on Mon, 25 Sep 2023 14:33:51

-0700 (PDT) typed >> Back when I was a practicing Mfg. Eng. at Solar Turbines I did extensive

Granted a little late, but something modeled on a brake cylinder hone might work

Granted a little late, but something modeled on a brake cylinder hone might work pyotr filipivich

---------------------------

When I was hunting for low cost used components to build my bucket loader the owner of a hydraulics shop proudly showed me the large cylinder honing machine he had designed and built.

Apparently the bore needs to be very smooth but not necessary exactly round or straight, the seals can accommodate variations. It's not like reboring an engine cylinder.

IIRC a former poster here had a business of resleeving brake cylinders with brass or bronze.

I duct-tape one end of a strip of abrasive cloth to a piece of dowel, wrap the strip around the dowel a few turns in the correct direction and put the dowel in an electric drill or drill press. Insert dowel in tube and run the drill. Grit of abrasive and size of dowel obviously to be chosen to suit requirements.

Perhaps unsuitable for production work but it serves me fine for various one-offs.

I duct-tape one end of a strip of abrasive cloth to a piece of dowel, wrap the strip around the dowel a few turns in the correct direction and put the dowel in an electric drill or drill press. Insert dowel in tube and run the drill. Grit of abrasive and size of dowel obviously to be chosen to suit requirements.

Perhaps unsuitable for production work but it serves me fine for various one-offs.

Mike Spencer Nova Scotia, Canada

-------------------------------

I thought about and may have tried winding thin foam with the sandpaper to maintain pressure as the abrasive wears down. Today at the auto parts store they had sandpaper with grit as fine as 5000.

What's that equivalent to in microns ? I have diamond paste ... I think "W 1" is one micron ? I was intending to use it to lap a loose roller bearing outer race on a 1939 Harley transmission . It's .0015" out of round and that causes all kinds of grief .

Clarification : I have several tubes of the diamond lapping paste with "W" numbers up to 40 .

On 9/27/2023 11:27 AM, Jim Wilkins wrote: Today at the auto parts

What's that equivalent to in microns ? I have diamond paste ... I think "W 1" is one micron ? I was intending to use it to lap a loose roller bearing outer race on a 1939 Harley transmission . It's .0015" out of round and that causes all kinds of grief . Snag

---------------------------

1/5000" or 0.0002" is 5 microns. I once demonstrated that I could adjust a 4 jaw lathe chuck by 1 micron to qualify for an optics tech job.

Now that's just plain showin' off . I can usually dial it under a thou , but depending on the project and subsequent operations even that is overkill .

Now that's just plain showin' off . I can usually dial it under a thou , but depending on the project and subsequent operations even that is overkill . Snag

-----------------------------

They brought me into that project as the electronic tech and I demonstrated that I could also handle the closely related optical tech, microwave-specific mechanical design and machining aspects of it, at least for the laboratory proof of concept. That's how I advanced beyond the expectations of the job I'd been hired for. My partly realized goal was to convince the engineers that they could design outside the bounds of their specialty and ask me to fill in the blanks or know which expert to call on.