Question 1

Is it possible to machine workpieces in the tombstone without side stoppers?

Accepted Answer

Normally, the side stoppers are not required. In heavier machining, it is possible to gain extra friction by adding small spikes between the workpiece and the stopper and between the clamp jaw and the workpiece.

Question 2

Do you also provide fixed stoppers or custom-made clamps based on drawings or on request?

Accepted Answer

We have a range of fixed stoppers that are designed for use in the OK Vise Rotary Pallet System and it is possible to perform certain tailoring tasks for the low-profile on request. Each case has to be reviewed individually. Feel free to contact us directly about your particular case.

Question 3

Can the other end of the clamp be placed against a fixed stop while the other end is performing the clamping action on the workpiece?

Accepted Answer

If the other jaw of a clamp lies against a fixed stop, make sure that the bolt is located in the middle of the wedge hole, so the wedge has enough space to move down when tightened, allowing free clamping action.

Question 4

Can you use these clamps hydraulically or pneumatically?

Accepted Answer

Yes, you can. Many customers do. You need to make sure that the cylinder creates enough, but not too much power to achieve the required and suitable clamping force.

Question 5

Do these clamps need any lubrication?

Accepted Answer

The regular cutting emulsion used in the machines provides usually sufficient lubrication.

Question 6

Are machinable jaws available in double-wedge models?

Accepted Answer

Machinable jaws only come with single-wedge models, which only provide horizontal jaw movement. Double-wedge models cannot be machined.

Question 7

If I need a clamping power of xxx (kN, how many (kpm) do I need in order to achieve the required clamping power?

Accepted Answer

OK Vise have prepared a moment table that indicates the correct measurements. This table is available on request.

Question 8

Is it possible to use the half inch bolt in the DK2-VT and DK2-WT models?

Accepted Answer

For clients using inch scale bolts, OK vise has designed wedges suitable for the half inch bolts. Clamps with wedges designed for these bolts are known as DK2-VTI and DK2-WTI. The are analogue versions of standard models DK2-VT and DK2-WT accordingly, except that the hole size in the middle of the wedge is slightly larger to fit the half inch bolt perfectly.

Question 9

What are the equivalent sizes of your metric bolts in inch scale?

Accepted Answer

The following in scale bolts can be used with OK-Vise low-profile clamps:

Series	Metric Bolt	Inch Bolt
Size A Clamps	M5	3/16 – 24 UNC
Size B Clamps	M8	5/16 – 18 UNC
Size D Clamps	M12	1/2 – 13 UNC
Size F Clamps	M16	5/8 – 11UNC

Question 10

OK Vise low-profile clamps are very powerful.  How do I control the power when our workpieces are thin or made of soft material?

Accepted Answer

You can control your clamping force by using a torque wrench or pneumatic tools with precisely selected torques.

Question 11

Should we use the soft or rough end of the jaws, if the machined material is soft?

Accepted Answer

OK Vise clamps come with both smooth and rough (serrated) jaw ends. In case of soft material such as plastic, brass or aluminium, we recommend using clamps with smooth jaw ends.

Question 12

Isn’t the workpiece going to move upwards, downwards or sideways when tightening the clamp?

Accepted Answer

The single-wedge clamps are designed to keep the workpiece steady in place allowing no upwards, downwards or sideways movement. Due to the clamps’ cross-wedge design in both the horizontal and the vertical plane, the clamp is locked firmly in every direction as it is tightened down.

With heavier and higher workpieces we recommend using the clamps with pull-down action (double-wedge, single wedge) to ensure that there is no upwards movement.

Question 13

What material do you use in your clamps and how hard are they?

Accepted Answer

The clamps are made of high-quality tool steel, and they are through-hardened to 48-52 HRC. Wedges always some with hardness of 48 to 52 HRC.

There are also softer long jaws designed to be machined according to a shape of the workpiece. These jaws come in a hardness of 30 to 34 HRC and can therefore be machined.

Question 14

It is claimed that the jaws can be machined to suit the geometry of the workpiece.  How deep can this machinable jaw be machined without weakening the structure of the jaw itself?

Accepted Answer

BK2-VT+3 – can be machined up to 3mm from the end of the jaw
DK2-VT+5 – can be machined up to 5mm from the end of the jaw
FK2-VT+5 – can be machined up to 5mm from the end of the jaw

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