Ronda 1017

 
Ronda 1017

Ronda 1017

Description

In the 1970ies, Ronda launched their caliber series 10xx/11xx/12xx/13xx, which made out one base caliber (1011) almost two dozen of variations with different features, with pin- and pallet lever and with different beating frequency.

To that series belonged also the Ronda 1017 shown here. It was a pin lever movement with day-date indication, center second and (here) 21 jewels. With a diameter of only 10 12 lignes, it beloged to the smallest movements of the series.

base plate

base plate

The base place shows, that this movement is massive and a pillar construction at the same time. You cannot see more of the construction, only that all important bearings (except the mainspring barrel and the center second) contain rubies. Interestingly, the round deepenings are not concentric with the ruby bearings, which make them look a bit odd.

If you look exactly, you can also see four blind jewels on the outer side of the base plate. None of these jewels has got a technical purpose, but together with the three cap jewels on the movement bridge, the otherwise 14 jewel pin lever movement is transformed into an impressive 21 jewel movement.

cap jewel plate

cap jewel plate

The three movemend side bearings of fourth, third and second wheel have got cap jewels, which are mounted in one single platelet. Oddly, the most significant bearing, the escapement wheel bearing, has got no cap jewel!

gear train

gear train

The gear train of the Ronda 1017 is contemporarily modern with mainspring barrel, second wheel, third wheel, center second wheel and escapement wheel. The gear train is driven on the dial side only by the outer gear of the mainspring barrel.

side view of the gear train

side view of the gear train

The anular balance is not shock protected. It still beats with slow 18000 A/h and regulates a pin lever movement.

empty dial side

empty dial side

On the yet empty dial side, you see, that the hands are driven by the mainspring barrel.

For a pin lever movement, it’s a bit unusual that it uses a compareatively expensive yoke winding system. It is very elaborate made with the setting lever spring being the setting lever at the same time.

You can also see the four blind jewels beneath the outer edge of the dial plate.

calendar workings

calendar workings

As often, Ronda uses a calendar mechanism with unusual quickset function: At 1 o’clock, there’s a moveable star wheel, which only enages with date ring, when turning back the time. It then advances the date. A slippable finger of the switching wheel at 11 o’clock ensures, that no harm occurs, when it simultaneously engages with the date ring during 11 and 12pm.

lower side of the switching wheel

lower side of the switching wheel

Imaging, that there’s an additional lever at 9 o’clock, which is reponsible for locking the date ring into its proper position. Unfortunately, this lever has got very good flying abilities…

calendar mechanism with mispositioned spring at 1 o'clock

calendar mechanism with mispositioned spring at 1 o'clock

The date correction star wheel at 1 o’clock is held in position by a spring. This spring shall be left (and not right, as on the photo) from the axle.

closed calendar mechanism

closed calendar mechanism

The lever at 5 o’clock ensures proper positioning of the weekday disc.

Ronda 1017: Dial side

Ronda 1017: Dial side

The weekday disk has got only one language and covers up the date mechanism.

Technical data

Manufacturer:Ronda
Caliber:1017
Number of jewels:21
Escapement:Pin lever
Balance types: Nickel anular balance
Balance bearing / direction hairspring:Clockwise
Construction:
  • lever
  • escape wheel, seconds wheel, third wheel, large driving wheel
  • mainspring barrel
Winding mechanism:yoke winding system
Setting lever spring:1 hole(s)
Features:SCD,QG,JG,RDR
Functions:hour, minute, second, day, week day
A/h:18000
Size:10 1/2''' (measured: 23,2mm)
Inventory number:17043