kurt vise problem

[rgollar]

I have a kurt vise that is fairly new and what I find is if you put an indicator on the back jaw and then clamp a part in it. It flexes .0015 to .0035 thousands depending how tight you clamp it. The model is the D688 kurt vise where there are only a key way and 2 bolts from the bottom. I was wondering if any one had the Kurt HD90 where they have 4 bolts from the top? It seems like this would help deflection. I am thinking about adding 2 bolts thru the back jaw and tapping into the vice its self to help hold the back jaw down from flexing. I was wondering what other people have done to fix this issue and does the new kurt vices stop this deflection? Thanks in advance

[greenxman]

yes i have they all do it. because something has to give. check the bolts first. how high are you in the vise ?the higher you go the more it will move. i have put a plate on the back. add two threaded holes on the back in the casting and then bolt threw the 2 jaw holes and the two new holes. just like the back of a double lock vise when you turn it into a large single.

[rgollar]

Great idea on the back holes of the vise. Thanks alot I will try that before I drill into the harden vise.

[jeff]

How tight are you trying to get this vise?

You'd be amazed at how little you need to tighten it to be effective.

[rgollar]

Just clamp in hand tight. I am not reafing on it. I just got a reply back from Kurt and they said .003 to .005 is normal for up to 80lbs of force. I bought a new chick vise and I have to say I am amazed it had no deflection at all. I just hate how it tightens. So I am going to try and beef up the back with a plate like suggested and see if that helps.

[jeff]

Just clamp in hand tight. I am not reafing on it. I just got a reply back from Kurt and they said .003 to .005 is normal for up to 80lbs of force. I bought a new chick vise and I have to say I am amazed it had no deflection at all. I just hate how it tightens. So I am going to try and beef up the back with a plate like suggested and see if that helps.

 

Why do you hate how the Chick vise tightens? I'm wanting to get a couple of these as soon as my cheap a$$ boss squeezes a couple of dollars from his butt.

[Goldorak]

I just got a reply back from Kurt and they said .003 to .005 is normal for up to 80lbs of force.

 

True, we got over a dozen of these vise and they ALL do this

 

if i need some precision i put 2 clamp on the top of the fix jaw to prevent deflection

[rgollar]

Why do you hate how the Chick vise tightens? I'm wanting to get a couple of these as soon as my cheap a$$ boss squeezes a couple of dollars from his butt.

 

I love the precision of the chic vise. But if you have any production its sucks how you have to insert the handle in the front and then tighten it and it hangs way out in the front so your not leaving it on the vise.

 

True, we got over a dozen of these vise and they ALL do this

 

if i need some precision i put 2 clamp on the top of the fix jaw to prevent deflection

 

great idea