From The President
Whether the application is thread verification of existing threads, or chasing or retapping deformed or impeded existing threads, it is essential that the correct toolholder be selected. In all cases the tool must follow the existing thread with as little impediment or resistance as possible. Ordinary floating tapholders, or rubber couplings are not suitable for these kinds of work; their use will result in stalling at entry, metal adhesions or out-of-phase rethreading. A properly designed compliant toolholder, will, in contrast, allow the tool to make effortless entry 100% of the time, and then permit the tool to glide easily through any correctly-sized thread.
New Vista’s TVM-ESCs are the most popular and widely used thread-sorting machines in the world. They are used for both “GO” and “NO GO” thread-verifications and are generally served from feeders, magazines or even hand fed. First introduced to the market in 2006, the longevity of these Machines is anchored in robust design and the use of the well-regarded New Vista TVU-STH Power Unit. TVM-ESCs are relentlessly reliable, they are compact and they will run either male or female threads. The latest models have quick-changeover capabilities built into them, and they cost less now than they ever have before.
New Vista’s flagship TVU-STHs are the most popularand widely used thread-verification and thread-chasing units in the world. Favored for automated and robotic applications, the STHs were first introduced to the market in 2006. Having made an early reputation for reliability, today’s models will run either male or female threads; they are more compact, easier to integrate, and accept more accessories than ever before.
For low volume applications or when there’s a lot of variety, a TVS-SV Thread Verification Station may be your best choice. To see these in action, look at VSV4 and VSV5 . The counter-balanced pantograph makes the Unit easy to maneuver and it keeps the Thread Gage Member straight with the work. Anybody can learn to be proficient with this unit; and crossthreading and jamming won’t be problems anymore.
Compared to single-spindle designs, the FLX Heads have no performance limits or disadvantages. Each FLX spindle has its own separate torque monitoring; and each spindle provides for separate thread depth setting. The screw threads being gaged don’t need to be all the same size nor the same depth either. As always with the New Vista designs you get (adjustable) limited torque going in, and much greater torque backing out, eliminating the possibility of jamming in the hole.
These “FLX” (multi-spindle) Heads run all the Thread Gage Members in simultaneously, so for applications where short cycles are required they are often the only sensible choice. Once set up and running there is very little maintenance required, and the investment costs have come down a lot in recent years. An FLX Head in 2015 now costs very little more than would a rotary-index (sequential) rig built for the same application.
New Vista is well known for its large offering of automated thread verification and chasing equipment. But not every application requires an automated solution. If your volume is limited, a powered handheld device may be the answer. If you are still gaging or chasing threads manually, it’s probably for one or more of these reasons:
- The guns you have seen are too slow.
- The gage / chaser tears up the mouth of the hole.
- If you bottom out on the thread, the gun jams, and you can’t back the tool out.
- Tool breakage is frequent.
There is a break-even point when considering whether to integrate a Thread Verification Station into a production line or just hand feed the Station, where the cost of paying a person to move parts is justified over laying out the capital for an automated device to perform this task, or vice versa. This is typically driven by cycle time and the architecture of the production process. So if you have a relatively slow cycle time, and have the personnel, hand sorting may be the best option.
Until relatively recently, manufacturers of auto and truck parts, medical and aerospace components and the like, relied on sampling inspection of threads using hand gages. But in the last dozen years, with an accelerated trend toward automated assembly; and with increased outsourcing of machined parts, it has become more urgent for them to move toward automated 100% thread gaging for many critical components.
New Vista’s TVM-INDs are one of the fastest thread-sorting machines in the New Vista arsenal. They can achieve sub-second cycle times, and perform other measurement tasks as well. They can achieve this speed because they are based on dial indexers. First introduced to the market in 2008, the longevity of these Machines is anchored in robust design and the use of the well-regarded New Vista TVU-STH Power Unit. TVM-INDs are relentlessly reliable, they are compact and they will run either male or female threads. The latest models have quick-changeover capabilities built into them, and they cost less now than they ever have before.