1. Read your equipment manual.
2. Check out this post which walks through setting up a manual system (video included!)
3. Before you begin blasting, read 5 Ways to Break Your Blaster for a quick guide on what not to do.

The AccuFlo cover slides off gently as one three-sided piece.

1. Loosen these two screws on the tank-side of the AccuFlo.

2. Brace the tank side of the unit with one hand and carefully slide the cover off with your other hand. Pull gently from the base.

The AccuFlo Tune-up Kit provides a backup of all wear items on the AccuFlo. A tune-up kit includes one of each of the following:

1. PowderGate output fitting
2. PowderGate nose piece
3. Tank cover O-ring

Use this table to select the right kit for your AccuFlo model micro-abrasive blaster.

To order a kit, contact Customer Service at 1-800-796-6626 or sales@comcoinc.com.

MB2247 Tune-Up Kit for the AccuFlo

MB2247-2 Tune-up Kit for the AccuFlo

MB2247-3 Tune-Up Kit for the AccuFlo

Don’t see your part on this list? Contact Customer Service at 1-800-796-6626 or sales@comcoinc.com.

General Recommendation

Turn the abrasive blend knob clockwise until it tightens. Leave the knob at this point on the dial. This is the maximum position.

Every blaster is configured to a specification. This means the tank orifice, the nozzle, and the blast pressure have been carefully selected for the application. The abrasive blend valve should sit fully closed, which happens when the knob is in the max position. This allows the most amount of abrasive to flow through your blaster. The amount of abrasive in the air stream is ultimately determined by the tank orifice, where abrasive enters the air stream.

Yes, You Can Break It.

There are two ways to ‘break’ this feature on your blaster:

1. Over-tightening the knob: The knob is a multi-turn knob that can be turned up to 7 full revolutions. It has a hard stop at the max position, but the needle valve seals against an O-ring so there is slight give, allowing a good seal to be created. Forcing the knob past the max position with a pair of pliers does not increase the volume of abrasive. Bending the stem, stripping the threads, or breaking off the knob while trying to force it past this hard stop requires factory service to repair.

2. Turning the knob too far counterclockwise: This opens the valve and reduces the air flow through the modulator. Reducing the airflow decreases the strength of the modulator pulses. Abrasive may still appear in the air stream, but it is only there due to gravity and suction and eventually trickles off. Turning the knob too far counterclockwise results in a loss of time and productivity. The abrasive stream produced is usually so weak and irregular that it creates an uneven surface finish on the targeted part. Operators also tend to pump the footswitch to compensate for the weak abrasive flow, accelerating wear on the machine.

How to Manage this Feature

First, set the abrasive blend knob at the maximum position:

1. If the knob feels tight when you attempt to turn it clockwise, stop! Do not over-tighten it. The knob is already in position. Leave it here.
2. If the knob feels loose and easily turns in either direction, then it is not in the maximum position. Turn the knob clockwise up to 7 revolutions until it feels tight. Leave it here.

Then, make the following adjustments to your blaster as needed:

• For more abrasive in the air stream, change the tank orifice.
• For a lot less abrasive, change the tank orifice.
• For just a little less abrasive, turn the abrasive blend knob counterclockwise 1/2- 3 revolutions. No more.

Need a Calibration Cap?

If several operators alternate use of your blaster, and you see a difference in abrasive flow between users, then a calibration cap is a good idea. A calibration cap locks this knob into the maximum position and reduces variability operator to operator. Contact Customer Service at sales@comcocinc.com or 1-800-796-6626 to place an order.

If you need additional guidance, please contact our Technical Support at 1-800-796-6626 or tech@comcoinc.com.

Use the following chart to determine the problem:

If you are unable to resolve this or any issue, contact our Technical Support Team at 1-800-796-6626 or techsupport@comcoinc.com.

Use the following chart to determine the problem:

• Verify that the appropriate abrasive hose is in use. We only recommend using our brand of abrasive hose with Comco equipment. If unsure, call our Customer Service at 1-800-796-6626.
• Verify that the hose from the output fitting to the pinch valve is pulled too tight or bent. A sharp bend creates a wear point.
• Inspect the output fitting for wear. If worn, it becomes crushed nuzzling the air and abrasive stream. Replace the fitting if necessary.
• WARNING: Do not cut off sections of the hose that appear worn and use the seemingly good hose.
  • If wear and holes are visible in one section of the hose, then the entire hose is probably near eruption. Replace the entire hose or risk turning your blaster into a snow globe.
    
• Inspect the pinch valve assembly. Any sharp edges on the plunger or pinch tube causes the hose to wear faster.

Are you using 3/8″ abrasive hose?

This larger abrasive hose requires a different type of connection than the QuickNut used on a standard 1/4″ hose. Proper installation for the larger hose fitting is critical. Installation requires 4 parts: the hose, the output fitting, a nut, and a 2-piece ferrule.

The 3/8″ abrasive hose must be pressed firmly into the output fitting prior to installation. Tighten the nut while holding the hose in place. The ferrule should crimp as the nut is tightened. Any gap between the hose and the output fitting creates turbulence in the abrasive stream and causes the fitting to fail along the side of the junction.

A poorly cut hose triggers quick wear. Check to see if the hose is cut raggedly or at an angle. The hose must have a straight, clean cut at its end.

1. INCORRECT: A ragged cut will cause turbulence in the output fitting.

2. INCORRECT: Cutting the abrasive hose at an angle will result in faster wear at the output fitting.

3. CORRECT: The hose end should be flat, straight and clean to fit securely in the fitting and reduce wear.

Don’t Just Cut the Worn Parts Off!

If the hose is already damaged or visibly worn in one spot, even at its end, replace the entire hose. The first noticeable sign of wear is a good indicator that the entire abrasive hose is thinning all over, even if you cannot see these worn points. Don’t just cut off the visibly worn area and use the remainder of the hose. You risk turning your workstation and your shop into a sudden snowglobe.

If you are unable to resolve this or any issue, contact our Technical Support Team at 1-800-796-6626 or techsupport@comcoinc.com.

Make sure that orifice is screwed into place. If it is off-track, air and abrasive will travel around the threads. Inspect the orifice for wear. If worn, the opening will grow large. Replace the orifice if necessary.

The modulator is a precision electro-magnetic valve that operates 50-60 times per second. This creates a pulsed air stream, fluidizing abrasive and drawing it from the tank to the mixing chamber.

• Diminished media flow after the first 5-10 seconds of blasting is a great indicator that the modulator is wearing out. A rattling sound is also a strong indicator.
• It should hum. If it rattles, replace it.

Learn more at Understanding Modulator Wear and Repair.

Oil contamination causes clumps and clogs of abrasive at the orifice in the abrasive tank and in the nozzle. These clogs disrupt air flow and worse, may cause check-valve failure. Oil contamination prevents the check-valve from sealing properly, allowing abrasive to pass back through the system. The aggressive nature of abrasive quickly erodes the O-rings and seals on these components, resulting in costly repairs.

To quickly spot oil contamination:

1. Look at the air line. New air lines running clean air are milky-white in color. Exposure to oil turns these lines orange or yellow.
2. Unscrew the black plastic bonnet inside the regulator to check for oil pools. Oil tends to pool in the regulator assembly of the AccuFlo.
3. Open the assembly to expose the filter element. If large clumps of abrasive are stuck to the filter element, oil is present in your blasting system.

Learn more on Oil Contamination and the Importance of Clean, Dry Air.

WARNING: The upper limit for air pressure is dictated by the house line pressure. There should be a 10 psi buffer between blast pressure and line pressure. Turning the regulator knob clockwise beyond the line pressure will not increase blast pressure and potentially damage the regulator diaphragm.

Use the following chart to determine the problem:

Yes, but you need an adaptor. Contact our Customer Service Specialists at 1-800-796-6626 or sales@comcoinc.com to determine adaptations and order part #MB2331.

• Standard AF nozzles range from .018-.060”.
• The AF is rated up to 7.5 SCFM.
• Remember, nozzle size + air pressure = air consumption. If using multiple nozzles, you may need to adjust your air pressure to keep it within the 7.5 SCFM range.

Read more about Comco Nozzles.

Our nozzles come in an array of shapes and sizes for a wide range of applications. The straight, round style nozzle with openings ranging from 0.015″ to 0.125″ meets most application requirements. Rectangular nozzles are available for applications that require a wide sweep or fan of abrasive.

Comco offers long-lasting Hi/Performance nozzles in addition to standard nozzles. Hi/Performance nozzles deliver an accelerated abrasive flow with a tighter focus, resulting in less overspray. The lifespan of these nozzles is 3-5x longer than most standard nozzles.

Read more about Comco Nozzles.

Use the following chart to determine the problem: