Haas VF-4 drawbar issues
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All Springer/NP/PCP Air Gun Discussion General
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Machine Shop Talk & AG Parts Machining
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Haas VF-4 drawbar issues
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Topic: Haas VF-4 drawbar issues (Read 1146 times))
SilentMatt
Sharp Shooter
Posts: 542
Real Name: Matt
Haas VF-4 drawbar issues
«
on:
March 28, 2017, 07:17:00 PM »
We're having issues with the drawbar sticking on our oldest('90's) Haas. Most everything I find on the web has to do with the taper sticking due to being worn,
but this also happens after it has been sitting overnight with no tool holder in the spindle. It's kind of annoying when the tool change times out before it pops tool out.
Just wondering if anyone has experienced anything similar?
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Lakeview, AR
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Rescue912
Sharp Shooter
Posts: 727
Re: Haas VF-4 drawbar issues
«
Reply #1 on:
March 28, 2017, 09:54:11 PM »
Do you have a spindle taper master? If so, blue it up, clamp it and look at the contact area. My guess is you have contact at the base but not at the mouth of the taper.
That will affect accuracy also allowing the tool point to move a bit in cut. If you don't have a master try bluing up a tool and see what you get.
Could also be your tool holders are worn but most sticking tools I've worked with seem to be caused by the bottom of the tool to spindle not fitting properly.
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Lafayette, Indiana
Stay tuned ...
SilentMatt
Sharp Shooter
Posts: 542
Real Name: Matt
Re: Haas VF-4 drawbar issues
«
Reply #2 on:
March 29, 2017, 12:55:19 AM »
It sticks regardless if a tool holder is in the spindle. It seems like it's somewhere in the drawbar bore.
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Lakeview, AR
Psalm 119:116
2400KT .22 HPA - in pieces
Kral PB .25 regged -traded
PP700 MKII
TalonP -sold
Marauder .25 regged -sold
Stormrider .22 -sold
JSAR AR Mrod .22 regged -traded
Evanix Max Air .22 -sold
Edgun Lelya 2.0 .22 -sold
FX Impact X .22 -sold
SPA M60B .22
Rescue912
Sharp Shooter
Posts: 727
Re: Haas VF-4 drawbar issues
«
Reply #3 on:
March 30, 2017, 10:56:30 AM »
You may have a broken belleville or two in your drawbar. Do you have a clamp force gage? I bet your clamping force is low.
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Lafayette, Indiana
Stay tuned ...
SilentMatt
Sharp Shooter
Posts: 542
Real Name: Matt
Re: Haas VF-4 drawbar issues
«
Reply #4 on:
March 30, 2017, 05:09:11 PM »
Don't have a gauge. It's funny, this morning it worked first push of the tool release but after that, the button has to be pushed a few times for it to pop free. It works fine if you don't let it sit with no tool changes for 5 minutes or more.
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Lakeview, AR
Psalm 119:116
2400KT .22 HPA - in pieces
Kral PB .25 regged -traded
PP700 MKII
TalonP -sold
Marauder .25 regged -sold
Stormrider .22 -sold
JSAR AR Mrod .22 regged -traded
Evanix Max Air .22 -sold
Edgun Lelya 2.0 .22 -sold
FX Impact X .22 -sold
SPA M60B .22
LeE
Marksman
Posts: 419
yes
Re: Haas VF-4 drawbar issues
«
Reply #5 on:
March 31, 2017, 07:36:13 PM »
This happened to an old Fadal I use to run parts on. I learned a trick from an old crusty machinist. Take a piece of scotchbrite on the spindle taper where is sticks and then clean out any remaining debris with a spindle taper wipe.
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SilentMatt
Sharp Shooter
Posts: 542
Real Name: Matt
Re: Haas VF-4 drawbar issues
«
Reply #6 on:
March 31, 2017, 10:06:48 PM »
We've cleaned and used scotchbrite to no avail. I think the problem is it the drawbar bore, but I'll keep digging.
Logged
Lakeview, AR
Psalm 119:116
2400KT .22 HPA - in pieces
Kral PB .25 regged -traded
PP700 MKII
TalonP -sold
Marauder .25 regged -sold
Stormrider .22 -sold
JSAR AR Mrod .22 regged -traded
Evanix Max Air .22 -sold
Edgun Lelya 2.0 .22 -sold
FX Impact X .22 -sold
SPA M60B .22
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Haas VF-4 drawbar issues