QM46 Dampening Adjustment issue

[dagoof]

I've got a QM46-2 and have been having problems with the PU1 damp unit since day one - I've got all the nips for the distribution, metering & form rollers at 2mm. However, in the manual there's an adjustment screw (page 159, section 4.4, diagram 9, screw #2) for the damp roller at the top - problem is, I don't seem to have an adjustment screw, instead there's a spring-loaded pin with a circlip on top.

Has anyone seem this before, or is it perhaps a modification? I can't adjust the nip through this, and it seems to be set at 4-5mm.

[dagoof]

I've attached a pic of this if it helps? Does anyone else have this circlip pin setup?

A related issue I'm having, when I ink up the dampening system the ink is being stripped off the metering roller which is leaving me with too much water.

[cmac75]

The set screw to the left is your adjustment.

[dagoof]

Thanks Cmac, we tried that but didn't get the adjustment required, not sure if there's a specific sequence the nips should be adjusted in (presuming one impacts the other).

The manual's diagram (attached) doesn't seem to match our system - is our system modified? Or is the manual perhaps for a newer version (our is a 1997 QM)? If so, could anyone help me out and confirm what all the nip measurements should be on this system?

Also, the nip between the form roller & plate states 3mm but, again, presuming this is for metal plates (states 0.15mm) - we're using Presstek poly plates (8 mil.), how should we adjust for this?

[Al Ferrari]

You may already know this, but #3 in that diagram is only the lock for the adjustment that is actually made by turning the eccentric that #3 impinges on. No wrench head is shown for that eccentric. That's a poor diagram.

Al

[dagoof]

I didn't actually, thanks Al.

[cmac75]

send me email I have diagram I can send you..cmactrinder75@gmail.com Also plate thickness doesnt matter its still 3mm stripe. You must drop dampner hand crank press around let sit 10 sec. lift dampner then look at stripe.If you just drop damp and lift off and then look at stripe it will not be set correct.

[STW100]

That damp unit was used for a short time and I believe there is no adj for the damp dist to form roller. I am supprised that you would have a 5mm stripe, usually the issue is little to no stripe. The damp dist roller shaft is flat on 3 sides & round on the 4th, the 4th side should be up. I would check the dia of the form roller (63mm) If you like give me a call.
Stan Intermountain Press Service,llc. 720-285-9485 ipsqm46.com
I do have numerous new & used parts avail for your QM46-2

[dagoof]

Thanks to Chuck for the diagram - and thanks for the info STW, I'm in the UK though.

[RGPW17100]

The older model QM46 only uses the spring as a self adjustment. There must be serial numbers out there that allow you to adjust that. I am guessing it is the very first machines and then they upgraded it with the springs. That press went through a lot of modifications before it finally became the printmaster. Even ordering rollers for that machine is based on serial number and even with the correct sn the rollers sent to you might not be the correct ones.