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Technical articles, repair guides and spare parts identification for TOS Trenčín and TRENS lathes. Here you will find practical information about maintenance, compatibility, part number differences and machine restoration for models such as SV18, SN40, SN50, SN63, SN71, SN400, SN500, SN630 and SN710.
Replacing the shear pin on TOS Trenčín SN lathes
Replacing a broken shear pin The shear pin is a simple but essential safety component used on TOS Trenčín SN lathes. Its purpose is to protect the thread cutting gearbox, leadscrew and feed mechanism from damage caused by overloads or accidental crashes. When the pin breaks, the machine may suddenly lose feed or threading capability even though the [...]
Replacing the screw and nut on SN carriages
TOS Trenčín cross slide screw and nut replacement A worn cross slide screw and nut is one of the most common causes of backlash, inaccurate dimensions and poor surface finish on TOS Trenčín SN lathes. As wear increases, precise positioning of the carriage becomes difficult and machining accuracy gradually deteriorates. In this guide we explain how to identify [...]
Replacing speed box oil filter on SN lathes
TOS Trenčín Oil Filter Maintenance for SN Lathes In order to keep you SN lathe going smoothly, you need to clean the oil filter 803260 from time to time. The oil filter is located on the back of speed gearbox. There is a handle on the filter, that can be turned in order to move the discs in [...]
Adjusting the multi-plate brake on SN32, SN50 and SN71
TOS Trenčín SN32 and SN50 Lathe Brake Adjustment Adjusting the brake on TOS Trenčín / TRENS SN32, SN40, SN45, SN50, SN55, SN63 and SN71. The multi-plate brake is accessible from the rear side of the machine, on the left side of the speed gearbox. The multi-plate brake is factory-adjusted by the manufacturer and therefore should not be adjusted [...]
Adjusting the clutch on SN32-SN50-SN71 lathes
TOS Trenčín SN Lathe Clutch Adjustment Adjusting the clutch on TOS Trenčín SN32, SN40, SN45, SN50, SN55, SN63 and SN71. The same principle applies also to SUI32, SUI40 and SUI50 as well ass to SN400, SN500, SN630 and SN710. The A and B multi-plate clutches are accessible after removing the cover on the rear side of the speed [...]
Joining the flat belt on SV18R lathe
How to Join Flat Drive Belts on TOS Trenčín SV18R Lathes The joining procedure described in this article applies specifically to the flat belt system used on TOS Trenčín SV18R lathes. The lather models SV18RA and SV18RD have a connected belt and does not need to be glued on the lathe. The flat drive belt used on TOS [...]
Replacing friction discs on TOS Trenčín lathes
Replacing clutch and brake friction discs on TOS Trenčín / TRENS lathes Worn friction discs on TOS SN series lathes can cause slipping, inconsistent engagement and unreliable operation of the feed and drive mechanisms. Over time, the friction surfaces, levers and locking blocks become worn, which affects smooth operation and can lead to increased wear of surrounding components. [...]
SN400-SN500-SN630-SN710 longitudinal lead screw half nut replacement
Guide for replacing the nuts in the holders When cutting a lot of threads on your SN400-SN500-SN630-SN710 lathe, the half nuts will wear over time. This is standard, the half nut is a wearable part and needs replacing time to time. Compared to the SN40-50-63-71 the half nut on the SN400-SN500-SN630-SN710 lathes is composed of two parts. The [...]
3 point vs 5 point rapid traverse cam
3 point vs 5 point rapid traverse cam TOS Trenčín introduced the rapid feed traverse on their SN lathes, specifically on the late version of the B model. The main components of the first rapid feed was the evolved worm 883036, the 3 point cam 883147, the bushing 883035, the gear wheel 883025 and the worm gear 807049. [...]
SN400-SN500-SN630-SN710 plates
Replacing plates on SN400-SN500-SN630-SN710 Since the start of the production of the SN400, SN500, SN630 and SN710 in the early 2000's, the plates on these lathes have undergone several design changes. Because we cannot keep producing all the possible designs and plates' variations, we have unified both and created an universal design that fits each lathe model individually, [...]
Lathe gib replacement
Lathe gib replacement When the gibs (or strip piece as some are referred to) on your lathe wears out to a point when you cannot adjust them with screws , your carriage gains play and this causes the loss of accuracy. At this point your only option is the replacement of your gib with a thicker one. The [...]