Product FAQs

FAQs | Toolholding

  • What is the advantage to using a Shrink Fit system? Shrink Fit tools offer the advantage of concentricity and low unbalance condition with maximum clearance. The complexity of changing the tool, requiring an induction heat source, reduces the complexity of the tool body itself making it a reliable solution to high speed or high volume applications.
  • What’s the advantage of using an ER power nut? The Power nut is a friction race design that maximizes gripping force and concentricity. Competitors offer this type of nut as an option costing upwards of 20% more than a standard offering by Parlec.
  • When would I select friction drive holder over positive drive holder? When the feed rate per tooth is lower, the need for concentricity goes up, reducing the cutting force and possibility of pull out or spinning. Friction drive holders offer the benefit of tighter concentricity when compared to a positive drive Weldon type holder.
  • When would I select Heat Shrink system over a Power Milling or Collet Chuck system? Heat Shrink is generally used with carbide cutting tools, where a Power Milling Chuck or Collet system can be used with high speed or colbalt cutters. The shank size needs much tighter control with shrink fit because the mechanism does not reduce the clamping size through tighter clamping. Heat shrink does not perform well when used with Weldon flats because the cylinder will bend to account for the void on the side of the shank with the flat. Power Milling chucks and Collet Chucks will have reduced friction, but do not create any additional run out caused by the flat.
  • What’s the advantage of using an ER collet chuck over a double angle collet chuck? Although the initial purchase of a double angle collet chuck is inexpensive, the timing of two angles on the collet aligning with two angles in the chuck result in an uneven collapse of the collet. Because of this, users will typically over tighten the assembly to reduce the risk of slippage causing excessive stress to the system; resulting excessive wear and damaged collets add to the maintenance cost. The DA system is advantageous however for applications where clearance is the number one criteria due its small nose diameter.
  • What are the common criteria for selecting a toolholder? Criteria include precision, versatility, ease of use, reliability, speed and economy. The Parlec website and catalog have a toolholding criteria matrix to help select the proper tooling style.
  • What’s the advantage of using an ER collet chuck over a Single Angle collet chuck? Single angle collets have extremely high gripping force as well as strong concentricity. However, the acme thread and large body diameter cause excessive unbalance and minimal nose clearance. ER collets have the best compromise between size offering and 60 degree threaded nuts, resulting in better high speed capability than Single Angle collet chucks.
  • For highest performance, which is more important: balance or concentricity? Concentricity is the most important criteria when looking for high performance. Although consideration for balance is extremely important, a balanced cutting assembly with poor concentricity will not machine in the expected way.

FAQs | Boring

  • Why do I choose a twin bore to rough? Using a twin bore to rough is advantageous because the balanced cutting forces allow you to remove 4x the amount of metal and feed at 2x the feed rate compared to unbalanced, single cutting forces.
  • Why does Parlec push coolant directly to the edge? Traditional boring heads push the coolant up towards the top of the head, but not directly to the cutting edge. As a result, the coolant does not enter the hole on small bores until the boring head is already well inside the bore; creating a condition of heat shock and decreasing insert life. In addition, high pressure coolant directly on the cutting edge increases the breaking and evacuation of chips providing longer, more reliable boring operation.
  • Can I back bore with a finish head? Yes, our series three finish head insert holders can be mounted in a forward or back boring attitude. Combined with our extended length insert holders, this makes precision back boring a simple operation with standard boring heads.
  • Does Modular Boring mean I’m paying an excessive cost for a standard part? No, Modular Boring components do not necessitate the disassembly of components after a boring operation. However, standard products available to build custom bars provide an instant stock solution to demanding bores. Discontinued work pieces do not obsolete your tooling; they can be dismantled and used to create new boring bars.
  • Can you do OD bores with your boring system? Standard large diameter boring system is designed for assembly either traditionally, or inverted to machine a boss on your work piece.
  • Can I rotate a large boring tool in my carousel to avoid interference within other tools? Yes, Parlec’s large diameter boring system comes standard with 45 and 90 degree clocking positions on the flange mount. This allows the cross bar to be mounted in various positions to best meet the needs between taking less stations and not interfering with other tools in the machine carousel.
  • If I have a specific coating or grade of carbide can I use it in the Parlec Boring System? Yes, all of our insert pockets fit standard ANSI/ISO geometry inserts. TCMT, SCMT, CCMT and WCMX geometry is utilized in all but the smallest boring bars.

FAQs | Tapping

  • Why buy Parlec’s Numertap 770 system rather than the more popular Bilz type tapping heads? The Numertap 770 system has the largest tapping range in the industry, inclusive of three Bilz style tapping head ranges. The system also comes available with standard, coolant through, coolant groove, and extended length tap adapters—making the Numertap 770 the most flexible system in the industry.
  • When I assemble my tap into the tapping system, it appears to run out. Is that normal? Yes, what appears to be runout is really float. Good tapping practice utilizes a tapping head that allows the tap to follow the hole. Unlike holding a tap in a collet chuck, all Numertap Tapping Heads, including the Rigid Type, have radial float to maximize the quality of threads.
  • What is the best type of tapping head to use when I am Synchronous or Rigid tapping? The best practice for rigid tapping is to use a tension only tapping head. A machine tool with a 32 bit processor uses the program to time the spindle rotation and feed. Although this sounds like an easy method for tapping, in many cases the timing is not exact, and as a result the threading operation is not correct. It is common for the tap to elongate, which is caused by the spindle slightly over rotating. The result of many cycles is the tap will pull out of the collet inevitably causing a crash. The tension only system will allow the over rotation to be taken up by the spring. The hard start ensures the same controlled thread depth as you would with a collet chuck. In addition, the tension only tapping head provides much needed radial float.
  • My floating reamer droops, how do I adjust it? You can adjust the amount of pressure by rotating the centering screw. This is accessed through the retention knob thread at the small end of the taper. By rotating the hex screw clockwise, you will increase the spring pressure. This will not change the amount of float but rather increase the amount of force needed for the reamer to float. Do not allow the screw to bottom out, the mechanism requires some clearance for it to operate. If you do let the screw bottom out, turn counterclockwise ½ turn.
  • Does your floating reamer holder work with dye cast parts? The Numerfloat is designed to follow a drilled hole with the same spindle centerline as the reamer. The float is only .007 radial and 1 degree angular. It is not recommended for dial or transfer line machines.

FAQs | Parsetter TMM

  • Who do I call for service on my Parsetter TMM? Call 1-800-PAR-6545 for all of your presetter service needs.
  • Where can I download the most current software? Go to: You will need to contact a service representative to obtain a user name and password ( or 1-800-727-6545). Once you are logged in, there will be instructions on how to get started and download the most current software.
  • How often should I have my machine calibrated?

    Please see below for annual maintenance options.

    • Gage Certification including cleaning, testing and NIST traceable certificate
    • Fulfills ISO 9001:2000, QS 9000 calibration requirements
    • Gage must be returned to Parlec for certification
    • Cleaning and Lubrication of all Applicable Parts
    • Adjusting of Mechanical and Optical Assemblies
    • Performance Evaluation and Verification of all functions
    • Free 2 hours of onsite training (Not valid after technician has left the site)
    • Does not include charges for parts replacement or repairs
    • Unlimited 1-800 Parsetter TMM technical support
    • Cleaning Fulfills ISO 9001:2000, QS 9000 calibration requirements
    • Includes Annual Maintenance Service, Gage Certification for up to two gages, and Laser Calibration Service for one machine.
    • Laser testing of two axis
    • Linear corrections as needed
    • Documentation of results
    • Adjusting of Mechanical and Optical Assemblies
    • Performance Evaluation and Verification of all functions

    Free 2 hours of onsite training (Not valid after technician has left the site). Does not include charges for parts replacement or repairs.

  • I keep getting an error message saying “too many users on the system”. How do I fix this?

    You are receiving this message because you have exceeded the number of users you can have logged into the system.

    To log other users out, go to the “Start” menu on your windows “All Programs-Parlec Folder- Launch Parlec User Monitor”.

    Login with your administrative username (please contact a Parlec service representative if you are unsure of this login).

    Select the user you wish to log out. Click “Log off User” on the bottom left of the window box.

    Click “Exit”. You should now be able to login.

  • My scales are not homing on my Parsetter TMM (1500,1550,1800,1850,Shrinkset), how can I fix this?

    The most common cause of scales not homing is having dirty scales. To clean your scales, you will need a clean rag and alcohol (isopropyl).

    For X scale:

    Slide the column of the presetter all the way to the left. Pull the bellows on the base of the machine out of your way(the bellows are held on by Velcro and will tear away). Once you have the internal part of the machine exposed, look for the scale on the back base of the presetter, it is a silver tape which runs along the whole base of the presetter. Now that you have located the scale, spray your clean rag with alcohol and wipe the entire scale thoroughly, be sure the scale is left clean and dry. Check to be sure there is no alcohol left on the scale.

    For Z scale:

    Lower the arm of your presetter to the bottom of axis travel. Pull back the Velcro bellows. The scale is vertically mounted on the back of the inside of the machine. It is the same cleaning process as the X scale.

  • In order to home my scales, I had to take off my reader head. How do I realign my reader head now that I’m putting it back on?

    Start by properly aligning the reader head to the bracket. On the bracket that bolts to the black foot of the machine, there is a shoulder that the reader head will sit up against. You need to make sure that the reader head is against the whole shoulder of the bracket. This will ensure that it is properly aligned to the whole scale.

    To properly gap the reader head to the scale, once you have already aligned the reader head to the bracket. When you are bolting the bracket onto the machine the correct gapping distance between the reader head and the scale is .008”. This is about the thickness of two pieces of paper. If the machine does not home after gapping the reader head try the thickness of one piece of paper.