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How to clean .0275" blind holes

Matt@RFR

Titanium
Joined
May 26, 2004
Location
Paradise, Ca
- 6061
- Ø.0275" +/-.0003, .450" deep (blind), 60 holes per part
- Only making 15 parts, so 900 holes total this size
- We put a ton of these size holes in other parts, but this is the first time seeing a blind version. The question is, how in the hell do we get our coolant out of the holes? We're running Oemeta Hycut at 8%. Currently we are pushing a .027" gage pin in each hole to push coolant out. That takes 3 goes in each hole to be satisfied there's hardly any coolant left in the hole. Then, the plater will run them through an agitated solvent batch and blow each small hole out with the smallest air nozzles he has. The parts will then get clear alodine.

The customer is working on a definition of "clean" as it pertains to this particular part, but 'probably' we just need to get the majority of the coolant out. They don't need to be surgically clean. Puting smaller vent holes in the back of the part is an option, but they would rather find a cleaning solution.
 
Although I'm still curious about your suggestions for cleaning holes like this, my customer decided to let us add vent holes to the part and be done with it.
 
- 6061
- Ø.0275" +/-.0003, .450" deep (blind), 60 holes per part
- Only making 15 parts, so 900 holes total this size
- We put a ton of these size holes in other parts, but this is the first time seeing a blind version. The question is, how in the hell do we get our coolant out of the holes? We're running Oemeta Hycut at 8%. Currently we are pushing a .027" gage pin in each hole to push coolant out. That takes 3 goes in each hole to be satisfied there's hardly any coolant left in the hole. Then, the plater will run them through an agitated solvent batch and blow each small hole out with the smallest air nozzles he has. The parts will then get clear alodine.

The customer is working on a definition of "clean" as it pertains to this particular part, but 'probably' we just need to get the majority of the coolant out. They don't need to be surgically clean. Puting smaller vent holes in the back of the part is an option, but they would rather find a cleaning solution.
Hypodermic needle/syringe with your solvent of choice. Shove to the bottom of hole and squirt it in so it runs back out the top of the hole.

Edit- 26g needle is approx. .020" and can be readily had in 1/2" length attached to a 5 or 10mL syringe.
 
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Well, what is clean?
A rat-hole.
But, flush with water. Blow like hell.
Irrigate with alcohol if you are going to the end of the trail.
Possibly in an agitated bath.
If you have the most discriminating of customer, an acetone finish may be called for.
Just a wild shot here.
 
Is this on a Speedio?

Yamazen has some machines set up to switch between TSC and through spindle air for use with grippers. Use they hypodermic needle noted above, and epoxy it into an 8mm bushing you can throw into a Schunk hydraulic holder (needs to be air tight after all). Program it with a drill op to feed (relatively quickly) down to a few thousands from the bottom of the hole and dwell it. Rapid out and move onto the next one. Easy peasy, faster than drilling the vent and probably less coolant in the end.
 








 
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