Robodrill Grind Plate Grind (GPG) Video
In this video, Scott is showing a recent GPG of a Robodrill spindle.
Omlat Torino Spindle Repair
This Omlat spindle had bearing failure. The front shaft journal was undersized and the drawbar threads were bent. In addition to repairing this spindle the customer wanted it converted to be able to use collet toolholding. We modified the shaft to accept a standard collet system. We also provided collets and collet nuts so the conversion was plug and play. The spindle was shipped back to the customer with our standard 1 year warranty.
We recently had a customer inform us that they were trying someone else due to the lead time we quoted them. We understand that from the customer’s point of view that they needed their spindle yesterday, in a manner of speaking. This particular customer did not have a spare and the OEM did not have any in stock. This certainly put the customer in a bind; so they did what they felt they had to in order to minimize downtime. This customer explained to us that they were happy with our quality and prices, and was hesitant to go elsewhere.
From our stand point this spindle had to have a grind chrome plating and finish grind to bring it back to specs; unfortunately this takes some time. The estimated lead time we quoted them was 5-10 business days. We always do our best to get a customer’s spindle back to them as quickly as we can. We understand how important it is to keep their business running smoothly.
They ended up sending the spindle to another vendor, who quoted them a 5 day lead time. This was their lead time for anything sent in regardless of how much work needed to be done.
We received a call from this customer after the spindle had been repaired by the other vendor. The customer let us know the other vendor took 7 weeks to return the spindle. The customer has since sent us another spindle to be rebuilt.
When it comes to turn around time we try our best to get the customer what they want. If we can’t do this we will tell you the truth. The truth hurts sometimes but it is for the best.
GMN TSEV-100SDU Spindle Repair
5,000 RPM
There were a few things that needed repair on this spindle. The grease was washed out of the front bearings. The grippers were missing so we replaced those. A housing rod had bent threads and needed to be replaced. The HSK taper had 20 microns runout which we corrected with a grind chrome plate and regrind bringing it back to specs. The front nuts also needed to be repaired. This was all done, inspected by our quality control department and returned to the customer.
Jung Surface Grinder
After breaking down this spindle to clean and inspect the overall dimensions we determined that the cause of failure was contaminated front and rear bearings. The front housing was egged with 7 microns of runout and was tapered.
We repaired this Jung surface grinder by replacing the bearings. We ground plated and reground the front housing in addition to our standard repair process.
Takisawa MCV-V1E
This customer has over 700 machine tools operating in their facility. We have done several spindle repairs for their sister plant and this plant was not happy with their current spindle rebuilder.
The spindle arrived at our facility and we started our evaluation. Upon disassembly of the spindle we found the bearing housing was out of round. This caused stress to the rolling elements as they did not have the proper clearance to function properly. The rear shaft nut had been gauled during the last repair by the other rebuilder and needed to be machined off.
The housing was ground plate ground in our grinding department and a new rear nut was manufactured. It is common for us to remanufacture spindle parts as the majority of them are custom to the spindle and can not be purchased.
Once the parts were completed the spindle repair moved to our clean room for assembly by an experienced technician. The spindle was put together using tools designed by Northland Tool & Electronics to ensure the proper assembly practices are followed. The spindle was then test run on our custom test stand duplicating the running speeds it will see in operation.
Mori Seiki MH-630 spindle repair
6,000 RPM
This spindle came in with the coupling for the drive motor attached to the rear of the shaft. Our incoming evaluation found the mating surfaces of these two parts was fretted and out of specification. This was causing vibration in the spindle resulting in poor part finish. This is one of the reasons we request you send as many of the rotating parts of the spindle that is reasonable. If we had not received the coupling and addressed the wear, the lifespan of the repair would have been reduced from the strain of the vibration and wear.
We ground plate ground the spindle shaft and the spindle drive coupling as a matched set. We replaced the bearings, adjusted preload, balanced, assembled and broke in the spindle before sending it through our vigorous QC process. View Our Mori Seiki Spindle Repair Page Here.
Kia KV40A Spindle Repair
6,000 RPM
This customer called us because his spindle was making too much noise even at low speeds. They were only running it at 1,000 RPM. The drawbar had already been replaced. We picked the spindle up at the customer’s location and brought it back to our facility where we thoroughly cleaned and inspected the spindle. We determined that there was front bearing failure from the bearings reaching the end of their expected life. The taper needed a kiss grind and the gripper fingers were worn.
We kiss ground the taper in our grinding department. We then adjusted the preload, replaced the bearings, balanced, assembled and broke in the spindle. The final step was our thorough QC check before we delivered the spindle back to the customer.
Hurco Spindle Repair
BMC 4020
6,000 rpm
Our customer sent in this spindle repair. The grease lubricated, 40 taper spindle was disassembled. We found that the front bearings were contaminated and the taper had run out. The spindle was quoted and the customer approved. The shaft was put in our grinding department for a kiss grind to the taper. Once the grind was finished the cleaned spindle went to our experienced technician for assembly. The spindle was assembled and balanced and run up. Final QC was performed and the spindle was sent to shipping. The spindle was shipped and it is up and running in the machine.
Omlat 6358 Spindle Repair
33,000 rpm
This spindle repair was received with the spindle seized up. Upon breakdown it was found that the front bearing cage was broken. The shaft pilot and journals had excessive run out.
The spindle shaft was ground,chrome plated and finish ground to specifications. The bearings were replaced. Our spindle repair technician needed to balance the spindle but required the tool holder. The customer sent in the tool holder and once received the technician was able to bring the balance in. The spindle was checked in quality control and passed all testing. The customer received their spindle repair and tool holder back.
It is very important to send in a tool holder with the spindle. We are able to check taper run out with your tooling and it is sometimes required for balancing purposes.