noisy strike train

[chrsvor25]

I just cleaned and fixed up a ST 89 mvt time strike from a tambour. The gears are loud when it strikes. What can i do?

 

[R&A]

Make sure the butter fly is not slipping.Plus did you bush the movement.

 

[Bryan Prindle]

C25,

More than likely the trundles on the lantern pinions are worn. They will really "talk" if they get grooved. I just did a search on "trundles" and a recent thread came up on the subject (11-1). Doesn't seem to cause problems with this play, just makes the clock noisy. :0:

Bryan

 

[wow]

I don't know what everybody else uses to replace the trundles, but I have had good luck with sewing needles. They are made of very hard steel.

 

[Joseph Bautsch]

I've always found the pinion wire from the supply houses, sewing needles and music wire, more often than not, not to be the size I need. Small Parts, Inc. has stainless vacuum drawn spring tempered wire in 30" lengths. The sizes start at .011" to .25" inch in .001" increments. The stuff is mirror polished and drawn to within + or - .0001" accuracy.

 

[R. Croswell]

I just cleaned and fixed up a ST 89 mvt time strike from a tambour. The gears are loud when it strikes. What can i do?

When you say “fixed up”, what did that include? In addition to worn trundles in the lantern pinions, if the pivot holes are worn you will get extra noise as well, especially at the fast turning arbors. Did you replace, or is it possible that someone else previously replaced the main spring? I believe this movement takes 0.016 x108” springs rather than the 0.018 x 96” springs that are often indiscriminately installed as a “universal replacement” for American clocks. Too much power from too thick a main spring will also add to the problem.

Bob C.

 

[chrsvor25]

I cleaned and oiled the movement. There was a mainspring missing to begin with. I got this clock at the Chapter 1 Mart, and Merritts had a table set up. I asked for a mainspring for this clock and got one. I'm not sure what size they gave me. I will look into that

 

[chrsvor25]

The source of the noise seems to be coming from the gear that turns the fly

 

[Steven Thornberry]

Are you sure it is not the fly itself, maybe a bit loose or brushing lightly against something?

 

[chrsvor25]

now that i have the mvt out of the case, it might be coming from the fly.

The pivott holes are all good.

I emailed the merritts person I dealt with about the mainspring. That might be part of it and probably needs to be fixed either way

 

[bchaps]

As others have stated, I find the ST 89 strike train to be very "noisy" if the upper train has any significant pivot hole or trundle wear. When the movement first comes into the shop, they are frequently coated in old oil and are quiet, but after an initial "Duncan Swish" to rid the excess oil, they sound like little buzz saws! Bushing worn pivot holes seems to dampen some of the noise.

 

[chrsvor25]

I'm going to switch the springs just to see if its solely the spring causing it. This needs to be fixed either way, but yeah.

 

[chrsvor25]

nope must be somethin else

 

[chrsvor25]

I took the fly off. I can hold it by the pivot and spin the fan around on its shaft. What now?

 

[shutterbug]

I took the fly off. I can hold it by the pivot and spin the fan around on its shaft. What now?

You want it to be able to turn, but not that easily You should be able to bend it with your fingers at the points where it touches the arbor. Then put it back on. If that fails, you can buy new fans at the regular suppliers.

 

[chrsvor25]

I know this is going to open up a whole new debate/can of worms but should I oil the fly anywhere

 

[shutterbug]

I know this is going to open up a whole new debate/can of worms but should I oil the fly anywhere

I do, but some swear that you shouldn't. I don't think it really matters much either way But for sure, don't oil the teeth. I put a tiny bit of oil on the points where it spins on the arbor. If it's tight, it will be fine.