Machine Rebuilding

Acme Gridley Rebuilding

BME offers complete rebuilding services for Acme Gridley mutli-spindle bar machines. Along with rebuilding the base machine, we also offer a complete turn-key tooled machine package to fit the customer’s needs.  Our mission is to supply our customer with all the means necessary to run their job, not just a piece of equipment that still requires hours of setup costs.  This starts from the time of proposal where we provide a detailed quotation to the customer, specifically describing our intended scope of work, minimizing the confusion of what is actually being purchased, and minimizing the need for changes on orders.  This consideration carries on after placement of the order, where bi-weekly Gantt Chart updates and pictures are provided to the customer, along with documented test results of the rebuilt machine.  After samples have been submitted and a runoff on BME Inc’s floor is conducted, where we encourage your operators take part in being fully trained on how to operate the machine and adjust the tooling, we duplicate the process on your floor after the machine has shipped.  Typically it doesn’t end there; we always pick up the phone to lend our expertise in solving a new challenge your staff may have with the project, long after shipment of the equipment.  This continuous contact outlook has allowed us to build very successful relationships with our customers, encouraging repeat projects.

Since we are also a manufacturer of tooling, we have the on-site manufacturing capabilities to rebuild and retool; thus controlling the cost and lead times of our projects.  Our staff includes personnel that have a combined 80 plus years of experience in diagnosing, designing, and debugging a variety of solutions to customer’s challenges on screw machines.  We have been able to rebuild machines for jobs that customers currently have been running, and with our approach to the job, yield 20-30% increases in parts per hour. All of our rebuilds come equipped with the Logan CS 2001 control package that includes tool counters and lock up detection, along with additional simple programmable inputs and outputs for auxiliary equipment that may be added much later in the life of the machine.  Click here for a link to Logan CS 2001 control package

If it’s a standard bar machine your looking for, or converting a bar machine to a “chucker” application, Please contact us for a quote!  We will provide a detailed proposal for your machine so you will know exactly what you are purchasing and will not be upsold after the initial order. Don’t have an existing machine to rebuild but need one? Contact us!  Between our current machine inventory, and our network of contacts who also have bar machines, we can find a machine to fit your needs.

General Description of a Base Rebuild:

  • Completely tear down machine
  • Castings inspected for excessive wear
  • Castings cleaned and painted
  • All parts inspected, worn parts repaired or replaced
  • New bevel gears
  • New large and small worm shaft gears
  • New bearings
  • New rolls and studs
  • New oil lines and filter
  • All slides ground, fitted, and returned to center height
  • Rebuild clutches with new parts as required
  • Back end rebuilt; new spools, 9L and 24L shafts, guide bushings, feed rings, feed plate, chucking shoes, pusher tubes, collet tube and nuts
  • Stock reel and stand rebuilt
  • Carrier rebuilt; stem ground and toolslide rebushed and fitted, new seals, spindles rebuilt, new front and rear retainers, front and rear oil flingers, keys, spindle gears and nuts, class 3 spindle bearings,
  • Rebuild coolant pump
  • New drill holders, lined bored on machine after test
  • New splash guards and spindle covers
  • Rebuild chip conveyor
  • Electrical system will be updated with Logan package (see 3.2)
  • Air system; filter, regulator/oiler and air lines will be replaced
  • New bushings, roll, and studs in index gear
  • Re-conditioned main toolslide
  • Re-conditioned locking pin and blocks
  • Equipped Logan HI-LO air clutches
  • Machine will meet OEM specifications on Radial, Spacing, and Straightness
  • Machine demonstration prior to ship, with training at our facility
  • Start up assistance at your facility

Below is an article about BME Inc. from Logan Clutch Corporation who has been making quality Acme Gridley products since 1975:


Acme-Gridley Screw Machine Rebuilder Improves Cycle Time by 33 Percent

The machine tool business has many challenges and in many companies there are still opportunities for reducing costs, improving productivity and machine reliability. Machine rebuilders are trusted partners who help customers to bring a high value machine back into optimal working condition even after years of use and millions of parts.

There are different options when selecting a machine rebuilder, especially when rebuilding an Acme-Gridley in the Great Lakes region. In this case the rebuilder is Brett May Engineering also known as BME. BME is better known for their attachments and tooling but they are also an excellent option for an Acme rebuild. BME offers complete rebuilding services for Acme-Gridley multi-spindle bar automatics. Along with rebuilding the base machine, they also offer a complete turn-key tooled machine to fit the customer’s needs. BME understands the benefit of the Logan Clutch Hi-Lo Retrokit and CS2001 control. They know that the Logan kit will reduce the cycle time of the part and that the machine will be more reliable using Logan pneumatic clutches and brake. The CS2001 control upgrades the electrical system with modern components and a microprocessor with a configureable system that works with an absolute encoder for setting up jobs and running the machine. 

To keep up with demand, the customer was paying overtime and also used an outside supplier to make parts. Part of the problem is that the machine was run so that they would avoid the risk of breaking the tooling. With the rebuilt machine using a Logan Hi-Lo Retrokit and CS2001 control the cycle time of the part was reduced from 13.5 to 9 seconds, which is a 33% reduction. The customer eliminated the overtime and will soon no longer need parts to be made by an outside supplier.

The Logan system eliminates the risk of tool breakage by having a reliable, consistent Hi-Lo brake system. The customer no longer has to adjust the clutches since the Logan air clutches are self-adjusting. Other benefits that the customer pointed out are the tapping failure detection and the machine lock-up detection. There are plans to do other machines. Logan Clutch appreciates the valuable partnership that it has with BME and their ability to integrate our products with their capabilities to help customers to reduce costs and improve productivity.

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