Mechanical Music Digest  Archives
You Are Not Logged In Login/Get New Account
Please Log In. Accounts are free!
Logged In users are granted additional features including a more current version of the Archives and a simplified process for submitting articles.
Home Archives Calendar Gallery Store Links Info

Announcement: End-of-Year Fundraising Drive In Progress

Our End-Of-Year Fundraising drive is in progress. If you haven't contributed to the operation of the MMD in the last 12 months, this would be a great time to contribute. There's a PayPal link at the bottom of each page on the website.

If you aren't sure when you last contributed, please send me a note using the contact form at the bottom of this page and I'll look you up in my records.

Thank you for your generous support!
Jody

P.S. While your support is needed and appreciated, you do not need to contribute to be a subscriber. If you have subscribed and aren't receiving your Digest, please use the contact form at the bottom of the page and let me know. Thanks!

MMD > Archives > December 1995 > 1995.12.05 > 04Prev  Next


Lindeman Player Piano
By Les Smith

With regards to the rebuilt Lindemen player problem, it would help to know what type of player action we're talking about, because they used at least 4 different actions-- Standard, Amphion, Pratt-Read and Angelus. Since you stated that it DOES have pneumatics, that eliminates Angelus (which used pouch pneumatics), so it probably is one of the other three. Do you know which one? Also, because of it's age, I assume that it has both primary and secondary valves. Correct? Before you post back to the list, there are a couple of very simple tests you can try that will help you isolate the problem. 1st check the lower bellows action. Disconnect all hoses and tubing leading to the pumping bellows and seal off their nipples with duct tape. A couple of stroke with the pedals should pull the reservoir(s) completely closed. How long will it (they) hold suction? 5, 10, 15, 20, 30 seconds? More? Can you hear any leaks? If so, have someone else pump the pedals and try to isolate the leak(s) using a stethoscope. Assuming that your rebuilt bellows are holding suc- tion for at least 30 seconds, reattach the hose(s) going to the stack and the one to the air motor. Put the transmission into "PLAY", the tempo at 0, and tape off the entire tracker bar with another piece of duct tape and start pumping. If you did a good job of rebuilding the valves and replacing the pouches the reservoir(s) should close just as quickly and hold suction just as long as they did before you attached the hoses to the stack and air motor. If they don't and if you can hear numerous leaks at this point, try to isolate them with the stethoscope. Most likely you'll find that the valves are not seating properly in the "off" position and therefor not holding suction. If you releathered the valves--top AND bottom-- the most likely cause of them not seating is that the pouches are holding them off their seats. This could be because the pouches don't have enough "dish" or because you used a lifter disk that was too thick. Remedies should be obvious. If, on the other hand, the valves DO hold suction at this point, remove the masking tape from the tracker bar and pump vigorously. While they probably won't all strike the strings hard enough to make them sound, all 88 hammers hammers should move to the strings. If they don't, it probably indicates that the valves are leaking at the TOP seats, or in the open position. The most common cause of this is TOO MUCH valve travel. The standard is 1/32", or, some- times 3/64". 1/16" is probably too much. As a final test, play a test roll that sounds the notes one at a time. When the notes play do they "spit" and can you hear them leaking? Once again this is a top seat problem, most probably related to too much valve travel, or not enough pouch movement. The remedies should be obvious. So run some tests and let us know the re- sults. BTW, after removing the duct tape from the tracker bar, clean the bar with some naptha to remove any traces of adhesive.

Les Smith


(Message sent Tue 5 Dec 1995, 16:20:48 GMT, from time zone GMT-0500.)

Key Words in Subject:  Lindeman, Piano, Player

Home    Archives    Calendar    Gallery    Store    Links    Info   


Enter text below to search the MMD Website with Google
Loading



CONTACT FORM: Click HERE to write to the editor, or to post a message about Mechanical Musical Instruments to the MMD

Unless otherwise noted, all opinions are those of the individual authors and may not represent those of the editors. Compilation copyright 1995-2017 by Jody Kravitz.

Please read our Republication Policy before copying information from or creating links to this web site.

Click HERE to contact the webmaster regarding problems with the website.

Please support publication of the MMD by donating online

Pay via PayPal

No PayPal account required

                                                       
Translate This Page

. .