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BMT65/75 - Sealing Turret Porosity

Service Home How To Procedures BMT65/75 - Sealing Turret Porosity
Recently Updated Last updated: 11/30/2023

BMT65/75 - Sealing Turret Porosity


BMT65/75 - Sealing Turret Porosity

- Jump to Section - 1. Tool List 2. Modify Mechanical Plugs (3 steps) 3. Seal Turret Porosity (8 steps) Back to Top

Tool List

  • Mityvac MV8255 Hand Pump
  • 8” 3/8" OD POLYURETHANE Hose - 58-2074
  • Mechanical Plugs - 39/100 in – These are modified, see Modify Mechanical Plugs section below.
  • Sealant – Recommend ISL-500C Medium, it cures in 4 hours. Vibra-Tite 122 Oil Tolerant Threadlocker will work, but it cures in 24 hours.
  • AirGun
  • Acetone
  • Turret Push-to-Connect Adapter
    • Straight Connector, 1/8 NPT Male, 3" Long
    • FITG NPT1/8F NPT1/8F STR BRASS – 58-2746
    • FITG REDUCER NPT1/4F NPT1/8M STR BRASS – 58-3657
    • FITG LBO 3/8 X 1/4 NPT-M STR – 58-3680

Modify Mechanical Plugs

1

Mechanical Plugs -39/100 in must be modified to plug lathe turret IN and OUT ports.

2

Cut the bolt of 2x plugs down to a length of 1.2" [1].

Use a belt grinder to reduce the diameter of the coolant IN plug to .36“ [2].

Use a belt grinder to reduce the diameter of the coolant OUT plug to .30" [3].

3

Reassemble both plugs. Use a belt grinder to taper the bottom of the rubber tube of the coolant OUT port plug [1].

Seal Turret Porosity

1

Coolant Out Port [1].

Front Port [2].

Side Port [3]. 

Coolant In Port [4].

2

Install 1/8 NPT plug into front port of the leaky pocket [1].

Apply a thin layer of red grease to each rubber plug [2] [3].

Install the small diameter rubber plug into the coolant OUT port [4] and tighten wingnut finger tight.

Install the large diameter rubber plug into the coolant IN port [5] and tighten wingnut finger tight.

3

Spray acetone into the cross drilled hole network until it is flooded [1].

Install 1/8 NPT to Push-To-Connect adapter into turret side port [2].

4

Install hand pump and pressurize cross drilled hole network. Maintain pressure until acetone weeping from porosity is visible.

5

Remove 1/8 NPT plug from turret front port and blow out acetone with shop air.

Reinstall 1/8 NPT plug into turret front port and pressurize with the hand pump until all acetone is pushed out of the porosity.

6

Remove 1/8 NPT plug from turret front port [1].

Pour the sealant into the turret side port until it almost reaches the turret front port, approximately 0.68 oz (20 mL) of sealant [2].

Reinstall the 1/8 NPT into the turret front port.

Continue to fill the turret side port with sealant until the cross drilled hole network is flooded [3].

Install the 1/8 NPT to Push-To-Connect adapter [4].

7

Use the hand pump to pressurize the cross drilled hole network to 30 PSI.

Once sealant is observed weeping from porosity maintain pressure for 1 min.

Remove 1/8 NPT to Push-To-Connect adapter.

8

Turn turret on its side so that the turret front port is over a bucket [1].

Remove turret front port 1/8 NPT plug [2] and blow out excess sealant into bucket [3].

Use a shop rag to clean sealant out of turret front and side port NPT threads and remove rubber plugs from coolant in and out ports [4].

Clean the 1/8 NPT to Push-To-Connect adapter with acetone to remove sealant residue.

Allow turret to cure for the time specified of the sealant used before performing air pressure leak test.

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