What is Trim Balance?

Trim balance is the final balance procedure done to a spindle after assembly and during full speed testing. This is procedure is necessary for two reasons. One, often additional components are attached to the shaft after assembly into the housing. Their imbalance will not be compensated for by the adjustments made on the Balancing Machine. [...]

2017-08-09T17:56:37+00:00April 6th, 2016|Spindle Repair Questions|

What is Imbalance and How is it Corrected?

Imbalance is caused by the displacement of the center of mass from the rotational axis which is a function of eccentricity in the distribution of the rotating mass. It is measured in units of mass and distance, e.g., gram-millimeters or gmm. Imbalance is considered in single plane modes and dual plane modes. Balancing is the [...]

2017-08-09T17:56:24+00:00April 6th, 2016|Spindle Repair Questions|

What Lubrication Should I Use?

Jessica is applying precision metered ultra-filtered grease in our special flow bench mini-clean room. Today there are many excellent lubricants for the full spectrum of spindle applications. The OEM should always be the first source for lubrication requirements. However, if that information is not available HST makes the following recommendations. Grease: Most spindles [...]

2017-08-09T17:56:11+00:00April 5th, 2016|Spindle Repair Questions|

Why Did My Spindle Fail?

In our data base of over 100,000 repairs we have seen a broad spectrum of failures. Some common failure causes include: Contamination Mishandling Incorrect Preload Overloaded Lubrication Imbalance Drawbar Mechanism Failures Statistical Bearing Failure For some tips on how to avoid premature failure visit our Blog under “ Spindle Tips”. Contamination Minute particulate resulted [...]

2017-08-09T17:55:55+00:00April 5th, 2016|Spindle Repair Questions|

What is a “Kiss Grind”?

A kiss grind, also sometimes referred to as a “breeze grind” is a light surface grind that will remove minor surface damage. It is typically used on tool interface surfaces such as CAT or BT tapers. Because it is a grinding process it can only remove high spots. Often taper surfaces have high spots as [...]

2017-08-09T17:55:40+00:00April 5th, 2016|Spindle Repair Questions|

What is GPG and Why is it Important?

GPG is the abbreviation for Grind – Plate – Grind. This is our process for surface restoration and it is used to restore out of tolerance critical surfaces like bearing journals to original specification.  This process is also used for restoring tool interface surfaces like CAT or HSK tapers. Our experience shows that about 35% [...]

2017-08-09T17:55:24+00:00April 5th, 2016|Spindle Repair Questions|

Does HST Have an Emergency Spindle Repair Service?

If you have a production critical machine down, HST can offer our emergency spindle repair service or what we call Quick Turnaround (QTA) service. Your spindle will move to the front of the line. Evaluation and quoting are completed within 24 hours. A normal comprehensive repair is usually 2-3 business days ARO. If the spindle [...]

2017-08-09T17:55:05+00:00April 1st, 2016|Spindle Repair Questions|

Can HST Repair My Spindle?

It is almost a certainty that we can repair your spindle to like new condition. HST has over 100,000 spindle repairs in our data base and over 30 years of experience. The chances are very good that we’ve repaired a spindle similar to yours. Our technicians understand the theory behind spindle design. They are fully [...]

2017-08-09T17:54:43+00:00April 1st, 2016|Spindle Repair Questions|